feat: Phase 7 — Accept/Reject DiffView, @-Mentions, Checkpoint/Rewind [appimage]

Accept/Reject DiffView:
- Bridge sendet checkpoint-before/after Events bei Edit/Write
- Rust speichert Datei-Snapshots in SQLite (content_before/after)
- Frontend zeigt interaktive DiffView mit Accept/Reject-Buttons
- Bei Reject: Datei wird automatisch auf Zustand VOR der Aenderung zurueckgesetzt
- Neues Modul: checkpoint.rs mit Accept/Reject/Rewind Commands

@-Mentions (Datei-Referenzen):
- @datei.ts im Chat-Input oeffnet Fuzzy-Autocomplete
- Fuzzy-Suche scannt Projektverzeichnis (max 5000 Dateien)
- Score-basiertes Ranking (Anfang, Separator, konsekutive Matches)
- Bei Auswahl: Dateiinhalt wird in Prompt injiziert (als Code-Block)
- @datei.ts#5-10 fuer Zeilenbereiche
- Neue Komponente: FileMention.svelte

Checkpoint/Rewind:
- Automatische Snapshots bei jeder Dateiänderung (Edit/Write)
- SQLite-Tabelle checkpoints mit content_before/content_after
- Rewind: Alle Dateien ab einem Checkpoint zuruecksetzen
- Commands: accept_change, reject_change, list_checkpoints, rewind_to_checkpoint

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/claude-bridge.js

@@ -43,6 +43,10 @@ let isQueryRunning = false;
 // So kann der User wie in Claude Code/VS Code Extension weiter tippen.
 const pendingMessages = [];
 
+// Tool-Changes: Bei Edit/Write wird der Diff an Rust/Frontend gemeldet
+// damit der User Accept/Reject entscheiden kann (Post-Execution mit Rewind)
+const CHANGE_TOOLS = ['Edit', 'Write'];
+
 // Agent-Modus (solo | handlanger | experten | auto)
 let agentMode = 'solo';
 
@@ -500,6 +504,9 @@ async function sendMessage(message, requestId, model = null, contextOverride = n
     // als auch als standalone tool_use Event. Via toolUseId deduplizieren.
     const handledTools = new Set();
 
+    // Tool-Info Cache: toolId → { name, filePath } fuer Checkpoint-After
+    const toolInfoCache = new Map();
+
     // Tool-Use handhaben — funktioniert sowohl fuer standalone tool_use Events
     // als auch fuer tool_use Bloecke innerhalb einer assistant-Nachricht
     function handleToolUse(ev) {
@@ -544,6 +551,19 @@ async function sendMessage(message, requestId, model = null, contextOverride = n
         agentId: currentAgentId,
       });
 
+      // Bei Edit/Write: Tool-Info cachen + Checkpoint-Event senden
+      if (CHANGE_TOOLS.includes(toolName) && toolInput.file_path) {
+        toolInfoCache.set(toolId, { name: toolName, filePath: toolInput.file_path });
+        sendEvent('checkpoint-before', {
+          toolId,
+          tool: toolName,
+          filePath: toolInput.file_path,
+          oldString: toolInput.old_string || null,  // Edit: was ersetzt wird
+          newString: toolInput.new_string || null,   // Edit: womit ersetzt wird
+          content: toolInput.content || null,         // Write: neuer Inhalt
+        });
+      }
+
       const toolSummary = summarizeToolInput(toolName, toolInput);
       sendMonitorEvent('tool', `${toolName} ${toolSummary}`, {
         toolId,
@@ -572,6 +592,17 @@ async function sendMessage(message, requestId, model = null, contextOverride = n
         success: !ev.is_error,
         agentId: currentAgentId,
       });
+
+      // Bei Edit/Write: Checkpoint-After senden damit Frontend den Diff anzeigen kann
+      const toolInfo = toolInfoCache.get(toolId);
+      if (!ev.is_error && toolInfo) {
+        sendEvent('checkpoint-after', {
+          toolId,
+          tool: toolInfo.name,
+          filePath: toolInfo.filePath,
+        });
+        toolInfoCache.delete(toolId);
+      }
     }
 
     // Hilfsfunktion: Iteration mit Fallback bei ungueltiger Session-ID.

src-tauri/src/checkpoint.rs

@@ -0,0 +1,125 @@
+// Claude Desktop — Checkpoint-System (Accept/Reject + Rewind)
+// Ermoeglicht das Rueckgaengigmachen von Datei-Aenderungen
+
+use std::sync::{Arc, Mutex};
+use tauri::command;
+
+use crate::db;
+
+/// Checkpoint-Info fuer Frontend (Serialisierbar)
+#[derive(Debug, serde::Serialize)]
+pub struct CheckpointInfo {
+    pub tool_id: String,
+    pub tool_name: String,
+    pub file_path: String,
+    pub status: String,
+    pub created_at: String,
+    pub has_diff: bool,
+}
+
+/// Aenderung akzeptieren — Checkpoint als 'accepted' markieren
+#[command]
+pub fn accept_change(
+    tool_id: String,
+    db_state: tauri::State<'_, Arc<Mutex<db::Database>>>,
+) -> Result<String, String> {
+    let db = db_state.lock().map_err(|e| e.to_string())?;
+    db.accept_checkpoint(&tool_id)
+        .map_err(|e| format!("Checkpoint akzeptieren fehlgeschlagen: {}", e))?;
+    println!("✅ Aenderung akzeptiert: {}", tool_id);
+    Ok("akzeptiert".to_string())
+}
+
+/// Aenderung ablehnen — Datei auf content_before zuruecksetzen
+#[command]
+pub fn reject_change(
+    tool_id: String,
+    db_state: tauri::State<'_, Arc<Mutex<db::Database>>>,
+) -> Result<String, String> {
+    let db = db_state.lock().map_err(|e| e.to_string())?;
+
+    let checkpoint = db
+        .get_checkpoint(&tool_id)
+        .map_err(|e| format!("Checkpoint laden fehlgeschlagen: {}", e))?
+        .ok_or_else(|| format!("Checkpoint nicht gefunden: {}", tool_id))?;
+
+    // Datei auf Zustand VOR der Aenderung zuruecksetzen
+    std::fs::write(&checkpoint.file_path, &checkpoint.content_before)
+        .map_err(|e| format!("Datei wiederherstellen fehlgeschlagen: {}", e))?;
+
+    db.reject_checkpoint(&tool_id)
+        .map_err(|e| format!("Checkpoint Status-Update fehlgeschlagen: {}", e))?;
+
+    println!(
+        "↩️ Aenderung abgelehnt + zurueckgesetzt: {} ({})",
+        checkpoint.file_path, tool_id
+    );
+    Ok(format!("Datei zurueckgesetzt: {}", checkpoint.file_path))
+}
+
+/// Alle Checkpoints einer Session auflisten
+#[command]
+pub fn list_checkpoints(
+    session_id: String,
+    db_state: tauri::State<'_, Arc<Mutex<db::Database>>>,
+) -> Result<Vec<CheckpointInfo>, String> {
+    let db = db_state.lock().map_err(|e| e.to_string())?;
+    let checkpoints = db
+        .list_checkpoints(&session_id)
+        .map_err(|e| format!("Checkpoints laden fehlgeschlagen: {}", e))?;
+
+    Ok(checkpoints
+        .into_iter()
+        .map(|c| CheckpointInfo {
+            tool_id: c.tool_id,
+            tool_name: c.tool_name,
+            file_path: c.file_path,
+            status: c.status,
+            created_at: c.created_at,
+            has_diff: c.content_after.is_some(),
+        })
+        .collect())
+}
+
+/// Zu einem bestimmten Checkpoint zurueckspulen (alle danach auch revert)
+#[command]
+pub fn rewind_to_checkpoint(
+    tool_id: String,
+    session_id: String,
+    db_state: tauri::State<'_, Arc<Mutex<db::Database>>>,
+) -> Result<Vec<String>, String> {
+    let db = db_state.lock().map_err(|e| e.to_string())?;
+    let checkpoints = db
+        .list_checkpoints(&session_id)
+        .map_err(|e| format!("Checkpoints laden fehlgeschlagen: {}", e))?;
+
+    // Alle Checkpoints ab dem angegebenen zuruecksetzen (neueste zuerst = richtige Reihenfolge)
+    let mut reverted_files = Vec::new();
+    let mut found = false;
+
+    for cp in &checkpoints {
+        if cp.tool_id == tool_id {
+            found = true;
+        }
+        if found && (cp.status == "completed" || cp.status == "pending") {
+            // Datei wiederherstellen
+            if let Err(e) = std::fs::write(&cp.file_path, &cp.content_before) {
+                println!("⚠️ Rewind fehlgeschlagen fuer {}: {}", cp.file_path, e);
+                continue;
+            }
+            let _ = db.reject_checkpoint(&cp.tool_id);
+            reverted_files.push(cp.file_path.clone());
+            println!("↩️ Rewind: {}", cp.file_path);
+        }
+    }
+
+    if !found {
+        return Err(format!("Checkpoint nicht gefunden: {}", tool_id));
+    }
+
+    println!(
+        "↩️ Rewind abgeschlossen: {} Dateien zurueckgesetzt",
+        reverted_files.len()
+    );
+    Ok(reverted_files)
+}

src-tauri/src/claude.rs

@@ -515,6 +515,57 @@ fn handle_bridge_message(app: &AppHandle, msg: BridgeMessage) {
                         let mut state = state.lock().unwrap();
                         state.agents.clear();
                     }
+                    "checkpoint-before" => {
+                        // Datei VOR der Aenderung lesen und als Snapshot speichern
+                        if let Some(file_path) = payload.get("filePath").and_then(|v| v.as_str()) {
+                            let content_before = std::fs::read_to_string(file_path).unwrap_or_default();
+                            let tool_id = payload.get("toolId").and_then(|v| v.as_str()).unwrap_or("");
+                            let tool_name = payload.get("tool").and_then(|v| v.as_str()).unwrap_or("");
+
+                            // In DB speichern
+                            if let Some(db_state) = app.try_state::<Arc<Mutex<db::Database>>>() {
+                                let db_lock = db_state.lock().unwrap();
+                                if let Ok(Some(session_id)) = db_lock.get_setting("active_session_id") {
+                                    let _ = db_lock.save_checkpoint(
+                                        tool_id,
+                                        &session_id,
+                                        tool_name,
+                                        file_path,
+                                        &content_before,
+                                    );
+                                    println!("📸 Checkpoint: {} ({} Bytes)", file_path, content_before.len());
+                                }
+                            }
+                        }
+                        let _ = app.emit("checkpoint-before", &payload);
+                    }
+                    "checkpoint-after" => {
+                        // Datei NACH der Aenderung lesen und Diff ans Frontend senden
+                        if let Some(file_path) = payload.get("filePath").and_then(|v| v.as_str()) {
+                            let tool_id = payload.get("toolId").and_then(|v| v.as_str()).unwrap_or("");
+                            let content_after = std::fs::read_to_string(file_path).unwrap_or_default();
+
+                            // content_before aus DB holen
+                            if let Some(db_state) = app.try_state::<Arc<Mutex<db::Database>>>() {
+                                let db_lock = db_state.lock().unwrap();
+                                if let Ok(Some(checkpoint)) = db_lock.get_checkpoint(tool_id) {
+                                    // Erweitertes Event mit Diff-Daten ans Frontend
+                                    let change_event = serde_json::json!({
+                                        "toolId": tool_id,
+                                        "tool": payload.get("tool"),
+                                        "filePath": file_path,
+                                        "contentBefore": checkpoint.content_before,
+                                        "contentAfter": content_after,
+                                    });
+                                    let _ = app.emit("file-change", &change_event);
+                                    println!("📝 Datei-Aenderung: {}", file_path);
+
+                                    // content_after in Checkpoint updaten
+                                    let _ = db_lock.update_checkpoint_after(tool_id, &content_after);
+                                }
+                            }
+                        }
+                    }
                     other => {
                         // Generische Weiterleitung aller Bridge-Events ans Frontend
                         // (subagent-started, subagent-stopped, monitor-event, mode-changed,

src-tauri/src/context.rs

@@ -591,3 +591,205 @@ pub async fn list_sticky_context(
 
     db.load_sticky_context().map_err(|e| e.to_string())
 }
+
+// ============ @-Mentions: Fuzzy File Search ============
+
+/// Datei-Ergebnis fuer Frontend
+#[derive(Debug, Serialize)]
+pub struct FileResult {
+    pub name: String,
+    pub path: String,       // Relativer Pfad
+    pub full_path: String,  // Absoluter Pfad
+}
+
+/// Ignorierte Verzeichnisse beim Datei-Scan
+const IGNORE_DIRS: &[&str] = &[
+    "node_modules", ".git", "target", "build", "dist", ".svelte-kit",
+    "__pycache__", ".next", ".nuxt", "vendor", ".cargo",
+];
+
+/// Relativen Pfad in absoluten aufloesen (relativ zum Projektverzeichnis)
+#[tauri::command]
+pub async fn resolve_file_path(
+    relative_path: String,
+    app: AppHandle,
+) -> Result<String, String> {
+    let working_dir = {
+        let state = app.state::<DbState>();
+        let db = state.lock().unwrap();
+        db.get_setting("working_dir")
+            .ok()
+            .flatten()
+            .unwrap_or_else(|| ".".to_string())
+    };
+
+    let full_path = std::path::Path::new(&working_dir).join(&relative_path);
+    if full_path.exists() {
+        Ok(full_path.to_string_lossy().to_string())
+    } else {
+        Err(format!("Datei nicht gefunden: {}", relative_path))
+    }
+}
+
+/// Dateiinhalt lesen (optional mit Zeilenbereich)
+#[tauri::command]
+pub async fn read_file_content(
+    file_path: String,
+    line_range: Option<String>,
+) -> Result<String, String> {
+    let content = std::fs::read_to_string(&file_path)
+        .map_err(|e| format!("Datei lesen fehlgeschlagen: {}", e))?;
+
+    // Zeilenbereich anwenden: "5-10" oder "5"
+    if let Some(range) = line_range {
+        let lines: Vec<&str> = content.lines().collect();
+        let parts: Vec<&str> = range.split('-').collect();
+        let start = parts[0].parse::<usize>().unwrap_or(1).saturating_sub(1);
+        let end = if parts.len() > 1 {
+            parts[1].parse::<usize>().unwrap_or(lines.len())
+        } else {
+            start + 1
+        };
+        let end = end.min(lines.len());
+
+        Ok(lines[start..end].join("\n"))
+    } else {
+        // Max 50KB
+        if content.len() > 50_000 {
+            Ok(content[..50_000].to_string() + "\n... (abgeschnitten bei 50KB)")
+        } else {
+            Ok(content)
+        }
+    }
+}
+
+/// Fuzzy-Suche in Projektdateien
+#[tauri::command]
+pub async fn fuzzy_search_files(
+    query: String,
+    app: AppHandle,
+) -> Result<Vec<FileResult>, String> {
+    // Aktives Projektverzeichnis ermitteln
+    let working_dir = {
+        let state = app.state::<DbState>();
+        let db = state.lock().unwrap();
+        db.get_setting("working_dir")
+            .ok()
+            .flatten()
+            .unwrap_or_else(|| ".".to_string())
+    };
+
+    let query_lower = query.to_lowercase();
+    let mut results: Vec<(FileResult, i32)> = Vec::new();
+
+    // Rekursiv Dateien scannen (max 5000)
+    let mut stack = vec![std::path::PathBuf::from(&working_dir)];
+    let mut file_count = 0;
+    let max_files = 5000;
+
+    while let Some(dir) = stack.pop() {
+        if file_count >= max_files {
+            break;
+        }
+
+        let entries = match std::fs::read_dir(&dir) {
+            Ok(e) => e,
+            Err(_) => continue,
+        };
+
+        for entry in entries.flatten() {
+            let path = entry.path();
+            let file_name = entry.file_name().to_string_lossy().to_string();
+
+            // Ignorierte Verzeichnisse ueberspringen
+            if path.is_dir() {
+                if !IGNORE_DIRS.contains(&file_name.as_str()) && !file_name.starts_with('.') {
+                    stack.push(path);
+                }
+                continue;
+            }
+
+            file_count += 1;
+
+            // Fuzzy-Match: Query-Zeichen muessen in Reihenfolge im Dateinamen vorkommen
+            let name_lower = file_name.to_lowercase();
+            let score = fuzzy_score(&query_lower, &name_lower);
+
+            if score > 0 {
+                let rel_path = path
+                    .strip_prefix(&working_dir)
+                    .unwrap_or(&path)
+                    .to_string_lossy()
+                    .to_string();
+
+                results.push((
+                    FileResult {
+                        name: file_name,
+                        path: rel_path,
+                        full_path: path.to_string_lossy().to_string(),
+                    },
+                    score,
+                ));
+            }
+        }
+    }
+
+    // Nach Score sortieren (hoechster zuerst), max 10 Ergebnisse
+    results.sort_by(|a, b| b.1.cmp(&a.1));
+    Ok(results.into_iter().take(10).map(|(r, _)| r).collect())
+}
+
+/// Fuzzy-Score berechnen: Wie gut passt query in target?
+/// Hoeher = besser. 0 = kein Match.
+fn fuzzy_score(query: &str, target: &str) -> i32 {
+    let query_chars: Vec<char> = query.chars().collect();
+    let target_chars: Vec<char> = target.chars().collect();
+
+    if query_chars.is_empty() {
+        return 0;
+    }
+
+    let mut score = 0i32;
+    let mut qi = 0;
+    let mut prev_match = false;
+
+    for (ti, &tc) in target_chars.iter().enumerate() {
+        if qi < query_chars.len() && tc == query_chars[qi] {
+            score += 10; // Basis-Punkte fuer Match
+
+            // Bonus fuer aufeinanderfolgende Matches
+            if prev_match {
+                score += 5;
+            }
+
+            // Bonus fuer Match am Anfang
+            if ti == 0 {
+                score += 15;
+            }
+
+            // Bonus fuer Match nach Separator (/, -, _, .)
+            if ti > 0 {
+                let prev = target_chars[ti - 1];
+                if prev == '/' || prev == '-' || prev == '_' || prev == '.' {
+                    score += 10;
+                }
+            }
+
+            qi += 1;
+            prev_match = true;
+        } else {
+            prev_match = false;
+        }
+    }
+
+    // Alle Query-Zeichen muessen matchen
+    if qi < query_chars.len() {
+        return 0;
+    }
+
+    // Bonus fuer exakte Laenge-Naehe (kurze Namen bevorzugen)
+    let length_diff = (target_chars.len() as i32 - query_chars.len() as i32).abs();
+    score -= length_diff;
+
+    score.max(1)
+}

src-tauri/src/db.rs

@@ -54,6 +54,19 @@ pub struct MonitorEvent {
     pub error: Option<String>,
 }
 
+/// Checkpoint-Eintrag (Datei-Snapshot fuer Accept/Reject + Rewind)
+#[allow(dead_code)]
+pub struct CheckpointEntry {
+    pub tool_id: String,
+    pub session_id: String,
+    pub tool_name: String,
+    pub file_path: String,
+    pub content_before: String,
+    pub content_after: Option<String>,
+    pub status: String,
+    pub created_at: String,
+}
+
 /// Datenbank-Wrapper
 pub struct Database {
     pub(crate) conn: Connection,
@@ -230,6 +243,19 @@ impl Database {
                 UNIQUE(error_hash)
             );
             CREATE INDEX IF NOT EXISTS idx_error_tracker_count ON error_tracker(occurrence_count DESC);
+
+            -- Checkpoints: Datei-Snapshots fuer Accept/Reject und Rewind
+            CREATE TABLE IF NOT EXISTS checkpoints (
+                tool_id TEXT PRIMARY KEY,
+                session_id TEXT NOT NULL,
+                tool_name TEXT NOT NULL,
+                file_path TEXT NOT NULL,
+                content_before TEXT NOT NULL,
+                content_after TEXT,
+                status TEXT NOT NULL DEFAULT 'pending',
+                created_at TEXT NOT NULL DEFAULT (datetime('now'))
+            );
+            CREATE INDEX IF NOT EXISTS idx_checkpoints_session ON checkpoints(session_id, created_at DESC);
             ",
         )?;
         Ok(())
@@ -887,6 +913,94 @@ impl Database {
         Ok(counts)
     }
 
+    // ============ Checkpoints (Accept/Reject + Rewind) ============
+
+    /// Checkpoint speichern (VOR der Aenderung)
+    pub fn save_checkpoint(
+        &self,
+        tool_id: &str,
+        session_id: &str,
+        tool_name: &str,
+        file_path: &str,
+        content_before: &str,
+    ) -> SqlResult<()> {
+        self.conn.execute(
+            "INSERT OR REPLACE INTO checkpoints (tool_id, session_id, tool_name, file_path, content_before, status)
+             VALUES (?1, ?2, ?3, ?4, ?5, 'pending')",
+            params![tool_id, session_id, tool_name, file_path, content_before],
+        )?;
+        Ok(())
+    }
+
+    /// Checkpoint After-Content updaten
+    pub fn update_checkpoint_after(&self, tool_id: &str, content_after: &str) -> SqlResult<()> {
+        self.conn.execute(
+            "UPDATE checkpoints SET content_after = ?1, status = 'completed' WHERE tool_id = ?2",
+            params![content_after, tool_id],
+        )?;
+        Ok(())
+    }
+
+    /// Checkpoint abrufen
+    pub fn get_checkpoint(&self, tool_id: &str) -> SqlResult<Option<CheckpointEntry>> {
+        let mut stmt = self.conn.prepare(
+            "SELECT tool_id, session_id, tool_name, file_path, content_before, content_after, status, created_at
+             FROM checkpoints WHERE tool_id = ?1"
+        )?;
+        let result: Vec<CheckpointEntry> = stmt.query_map(params![tool_id], |row| {
+            Ok(CheckpointEntry {
+                tool_id: row.get(0)?,
+                session_id: row.get(1)?,
+                tool_name: row.get(2)?,
+                file_path: row.get(3)?,
+                content_before: row.get(4)?,
+                content_after: row.get(5)?,
+                status: row.get(6)?,
+                created_at: row.get(7)?,
+            })
+        })?.collect::<SqlResult<Vec<_>>>()?;
+        Ok(result.into_iter().next())
+    }
+
+    /// Alle Checkpoints einer Session (neueste zuerst)
+    pub fn list_checkpoints(&self, session_id: &str) -> SqlResult<Vec<CheckpointEntry>> {
+        let mut stmt = self.conn.prepare(
+            "SELECT tool_id, session_id, tool_name, file_path, content_before, content_after, status, created_at
+             FROM checkpoints WHERE session_id = ?1 ORDER BY created_at DESC LIMIT 100"
+        )?;
+        let result = stmt.query_map(params![session_id], |row| {
+            Ok(CheckpointEntry {
+                tool_id: row.get(0)?,
+                session_id: row.get(1)?,
+                tool_name: row.get(2)?,
+                file_path: row.get(3)?,
+                content_before: row.get(4)?,
+                content_after: row.get(5)?,
+                status: row.get(6)?,
+                created_at: row.get(7)?,
+            })
+        })?.collect::<SqlResult<Vec<_>>>()?;
+        Ok(result)
+    }
+
+    /// Checkpoint-Status auf 'rejected' setzen
+    pub fn reject_checkpoint(&self, tool_id: &str) -> SqlResult<()> {
+        self.conn.execute(
+            "UPDATE checkpoints SET status = 'rejected' WHERE tool_id = ?1",
+            params![tool_id],
+        )?;
+        Ok(())
+    }
+
+    /// Checkpoint-Status auf 'accepted' setzen
+    pub fn accept_checkpoint(&self, tool_id: &str) -> SqlResult<()> {
+        self.conn.execute(
+            "UPDATE checkpoints SET status = 'accepted' WHERE tool_id = ?1",
+            params![tool_id],
+        )?;
+        Ok(())
+    }
+
     // ============ Phase 2.0: Fehler-Tracking ============
 
     /// Fehler-Occurrence zählen und zurückgeben

src-tauri/src/lib.rs

@@ -12,6 +12,7 @@ use tauri::{
 use webkit2gtk::WebViewExt;
 
 mod audit;
+mod checkpoint;
 mod claude;
 mod clipboard;
 mod commands;
@@ -150,6 +151,9 @@ pub fn run() {
             context::log_context_failure,
             context::get_full_context,
             context::list_sticky_context,
+            context::fuzzy_search_files,
+            context::resolve_file_path,
+            context::read_file_content,
             // Voice-Interface
             voice::transcribe_audio,
             voice::text_to_speech,
@@ -196,6 +200,11 @@ pub fn run() {
             clipboard::clipboard_watch_status,
             // Slash-Command Registry
             commands::get_slash_commands,
+            // Checkpoints (Accept/Reject + Rewind)
+            checkpoint::accept_change,
+            checkpoint::reject_change,
+            checkpoint::list_checkpoints,
+            checkpoint::rewind_to_checkpoint,
         ])
         .setup(|app| {
             let handle = app.handle().clone();

src/lib/components/ChatPanel.svelte

@@ -1,12 +1,14 @@
 <script lang="ts">
 	import { invoke } from '@tauri-apps/api/core';
 	import { emit, listen } from '@tauri-apps/api/event';
-	import { messages, currentInput, isProcessing, addMessage, currentSessionId, messageToDb, queuedMessage, messageQueue, agentMode, type Message, type QuickAction } from '$lib/stores/app';
+	import { messages, currentInput, isProcessing, addMessage, currentSessionId, messageToDb, queuedMessage, messageQueue, agentMode, pendingChanges, type Message, type QuickAction, type FileChange } from '$lib/stores/app';
 	import { currentTool, processingPhase } from '$lib/stores/events';
 	import { marked, type Tokens } from 'marked';
 	import { tick, onDestroy, onMount } from 'svelte';
 	import { get } from 'svelte/store';
 	import CommandPalette from './CommandPalette.svelte';
+	import DiffView from './DiffView.svelte';
+	import FileMention from './FileMention.svelte';
 	import QuickActions from './QuickActions.svelte';
 
 	// Props
@@ -323,18 +325,45 @@
 	let commandQuery = $state('');
 	let commandPaletteRef: CommandPalette | undefined = $state(undefined);
 
-	// Slash-Command Erkennung im Input
+	// @-Mention Autocomplete State
+	let showFileMention = $state(false);
+	let mentionQuery = $state('');
+	let fileMentionRef: FileMention | undefined = $state(undefined);
+
+	// Slash-Command und @-Mention Erkennung im Input
 	$effect(() => {
 		const text = $currentInput;
 		if (text.startsWith('/')) {
 			showCommandPalette = true;
 			commandQuery = text.slice(1);
+			showFileMention = false;
 		} else {
 			showCommandPalette = false;
 			commandQuery = '';
 		}
+
+		// @-Mention: Suche das letzte @ im Text
+		const atMatch = text.match(/@([\w.\-/]+)$/);
+		if (atMatch && atMatch[1].length > 0) {
+			showFileMention = true;
+			mentionQuery = atMatch[1];
+		} else {
+			showFileMention = false;
+			mentionQuery = '';
+		}
 	});
 
+	// @-Mention: Datei ausgewaehlt → @query durch @dateiname ersetzen
+	function handleFileSelect(file: { name: string; path: string; full_path: string }) {
+		// Ersetze das letzte @query durch @dateiname
+		const text = $currentInput;
+		const atIdx = text.lastIndexOf('@');
+		if (atIdx >= 0) {
+			$currentInput = text.substring(0, atIdx) + `@${file.path} `;
+		}
+		showFileMention = false;
+	}
+
 	// Command auswählen: Text ersetzen
 	function handleCommandSelect(cmd: { name: string; description: string; category: string }) {
 		if (!cmd.name) {
@@ -734,6 +763,29 @@
 		$queuedMessage = null;
 	}
 
+	// Accept/Reject Datei-Aenderungen
+	async function acceptChange(toolId: string) {
+		try {
+			await invoke('accept_change', { toolId });
+			pendingChanges.update((changes) => changes.filter((c) => c.toolId !== toolId));
+			console.log('✅ Aenderung akzeptiert:', toolId);
+		} catch (err) {
+			console.error('Accept fehlgeschlagen:', err);
+		}
+	}
+
+	async function rejectChange(toolId: string) {
+		try {
+			const result = await invoke<string>('reject_change', { toolId });
+			pendingChanges.update((changes) => changes.filter((c) => c.toolId !== toolId));
+			addMessage('system', `↩️ ${result}`);
+			console.log('↩️ Aenderung abgelehnt:', toolId);
+		} catch (err) {
+			console.error('Reject fehlgeschlagen:', err);
+			addMessage('system', `Fehler beim Zuruecksetzen: ${err}`);
+		}
+	}
+
 	async function sendMessage() {
 		const text = $currentInput.trim();
 		if (!text) return;
@@ -765,6 +817,26 @@
 			}
 		}
 
+		// @-Mentions aufloesen: @pfad/datei.ts durch Dateiinhalt ersetzen
+		let resolvedText = text;
+		const mentionPattern = /@([\w.\-/]+(?:#\d+(?:-\d+)?)?)/g;
+		const mentions = [...text.matchAll(mentionPattern)];
+		for (const match of mentions) {
+			const ref = match[1];
+			const [filePath, lineRange] = ref.split('#');
+			try {
+				const fullPath = filePath.startsWith('/') ? filePath : await invoke<string>('resolve_file_path', { relativePath: filePath });
+				const content = await invoke<string>('read_file_content', { filePath: fullPath, lineRange: lineRange || null });
+				const ext = filePath.split('.').pop() || '';
+				resolvedText = resolvedText.replace(
+					match[0],
+					`\n\`\`\`${ext} (${filePath})\n${content}\n\`\`\`\n`
+				);
+			} catch {
+				// Datei nicht gefunden — @-Mention unverändert lassen
+			}
+		}
+
 		// User-Nachricht sofort im Chat anzeigen + in DB speichern
 		const msgId = crypto.randomUUID();
 		const msg: Message = {
@@ -785,7 +857,8 @@
 		}
 
 		try {
-			await invoke('send_message', { message: text });
+			// Aufgeloesten Text an Claude senden (mit eingebetteten Datei-Inhalten)
+			await invoke('send_message', { message: resolvedText });
 		} catch (err) {
 			console.error('Fehler beim Senden:', err);
 			addMessage('system', `Fehler: ${err}`);
@@ -801,6 +874,12 @@
 			if (handled) return;
 		}
 
+		// FileMention hat Vorrang bei @-Autocomplete
+		if (showFileMention && fileMentionRef) {
+			const handled = fileMentionRef.handleKey(event);
+			if (handled) return;
+		}
+
 		// Ctrl+Enter: Immer senden (auch bei mehrzeiligem Text)
 		if (event.key === 'Enter' && event.ctrlKey) {
 			event.preventDefault();
@@ -1166,6 +1245,32 @@
 		{/if}
 	</div>
 
+	<!-- Pending Changes: DiffView mit Accept/Reject -->
+	{#if $pendingChanges.length > 0}
+		<div class="pending-changes">
+			<div class="pending-changes-header">
+				<span>📝 {$pendingChanges.length} Datei-Aenderung{$pendingChanges.length > 1 ? 'en' : ''}</span>
+				<button
+					class="btn-accept-all"
+					onclick={() => $pendingChanges.forEach((c) => acceptChange(c.toolId))}
+				>
+					✅ Alle behalten
+				</button>
+			</div>
+			{#each $pendingChanges as change (change.toolId)}
+				<DiffView
+					oldText={change.contentBefore}
+					newText={change.contentAfter}
+					filename={change.filePath}
+					interactive={true}
+					toolId={change.toolId}
+					onAccept={acceptChange}
+					onReject={rejectChange}
+				/>
+			{/each}
+		</div>
+	{/if}
+
 	<div class="chat-input">
 		<CommandPalette
 			bind:this={commandPaletteRef}
@@ -1173,6 +1278,12 @@
 			visible={showCommandPalette}
 			onSelect={handleCommandSelect}
 		/>
+		<FileMention
+			bind:this={fileMentionRef}
+			query={mentionQuery}
+			visible={showFileMention}
+			onSelect={handleFileSelect}
+		/>
 		{#if $agentMode && $agentMode !== 'solo'}
 			<div class="mode-indicator mode-{$agentMode}">
 				<span class="mode-icon">
@@ -1925,6 +2036,41 @@
 	/* Alte Typing-Animation entfernt — ersetzt durch .activity-indicator */
 
 	/* Input-Bereich */
+	/* Pending Changes (Accept/Reject DiffView) */
+	.pending-changes {
+		border-top: 2px solid var(--accent);
+		background: var(--bg-secondary);
+		max-height: 300px;
+		overflow-y: auto;
+		flex-shrink: 0;
+	}
+
+	.pending-changes-header {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		padding: var(--spacing-xs) var(--spacing-sm);
+		font-size: 0.7rem;
+		color: var(--text-secondary);
+		border-bottom: 1px solid var(--border);
+	}
+
+	.btn-accept-all {
+		padding: 2px 8px;
+		font-size: 0.6rem;
+		background: rgba(34, 197, 94, 0.15);
+		border: 1px solid var(--success);
+		border-radius: var(--radius-sm);
+		color: var(--success);
+		cursor: pointer;
+		font-weight: 600;
+	}
+
+	.btn-accept-all:hover {
+		background: var(--success);
+		color: white;
+	}
+
 	.chat-input {
 		display: flex;
 		gap: var(--spacing-sm);

src/lib/components/DiffView.svelte

@@ -1,15 +1,28 @@
 <script lang="ts">
 	// DiffView — Zeigt Unterschiede zwischen altem und neuem Code
-	// Verwendet für Edit-Tool Ergebnisse
+	// Mit optionalen Accept/Reject-Buttons fuer interaktiven Modus
 
 	interface Props {
 		oldText: string;
 		newText: string;
 		filename?: string;
 		language?: string;
+		interactive?: boolean;
+		toolId?: string;
+		onAccept?: (toolId: string) => void;
+		onReject?: (toolId: string) => void;
 	}
 
-	let { oldText, newText, filename = '', language = '' }: Props = $props();
+	let {
+		oldText,
+		newText,
+		filename = '',
+		language = '',
+		interactive = false,
+		toolId = '',
+		onAccept,
+		onReject,
+	}: Props = $props();
 
 	// Einfache Diff-Berechnung (zeilenbasiert)
 	interface DiffLine {
@@ -31,7 +44,7 @@
 
 		while (oldIdx < oldLines.length || newIdx < newLines.length) {
 			if (lcsIdx < lcs.length && oldIdx < oldLines.length && oldLines[oldIdx] === lcs[lcsIdx]) {
-				// Unveränderte Zeile
+				// Unveraenderte Zeile
 				if (newIdx < newLines.length && newLines[newIdx] === lcs[lcsIdx]) {
 					result.push({
 						type: 'unchanged',
@@ -42,7 +55,7 @@
 					newIdx++;
 					lcsIdx++;
 				} else {
-					// Neue Zeile hinzugefügt
+					// Neue Zeile hinzugefuegt
 					result.push({
 						type: 'added',
 						lineNo: { old: null, new: newIdx + 1 },
@@ -59,7 +72,7 @@
 				});
 				oldIdx++;
 			} else if (newIdx < newLines.length) {
-				// Zeile hinzugefügt
+				// Zeile hinzugefuegt
 				result.push({
 					type: 'added',
 					lineNo: { old: null, new: newIdx + 1 },
@@ -105,7 +118,7 @@
 		return result;
 	}
 
-	// Diff berechnen wenn sich Inputs ändern
+	// Diff berechnen wenn sich Inputs aendern
 	let diffLines = $derived(computeDiff(oldText, newText));
 
 	// Statistiken
@@ -114,24 +127,81 @@
 		removed: diffLines.filter(l => l.type === 'removed').length,
 		unchanged: diffLines.filter(l => l.type === 'unchanged').length,
 	});
+
+	// Nur geaenderte Zeilen anzeigen mit Kontext (3 Zeilen davor/danach)
+	let showFullDiff = $state(false);
+	let contextLines = 3;
+
+	function getVisibleLines(): { line: DiffLine; idx: number }[] {
+		if (showFullDiff) return diffLines.map((line, idx) => ({ line, idx }));
+
+		const changedIndices = new Set<number>();
+		diffLines.forEach((line, idx) => {
+			if (line.type !== 'unchanged') {
+				for (let i = Math.max(0, idx - contextLines); i <= Math.min(diffLines.length - 1, idx + contextLines); i++) {
+					changedIndices.add(i);
+				}
+			}
+		});
+
+		return Array.from(changedIndices).sort((a, b) => a - b).map(idx => ({ line: diffLines[idx], idx }));
+	}
+
+	let visibleLines = $derived(getVisibleLines());
+
+	function handleAccept() {
+		if (onAccept && toolId) onAccept(toolId);
+	}
+
+	function handleReject() {
+		if (onReject && toolId) onReject(toolId);
+	}
+
+	// Dateiname kuerzen fuer Anzeige
+	function shortenPath(path: string): string {
+		const parts = path.split('/');
+		if (parts.length > 3) return `.../${parts.slice(-2).join('/')}`;
+		return path;
+	}
 </script>
 
-<div class="diff-view">
+<div class="diff-view" class:interactive>
-	{#if filename}
+	<div class="diff-header">
-		<div class="diff-header">
+		<div class="diff-header-left">
-			<span class="filename">{filename}</span>
+			{#if filename}
+				<span class="filename" title={filename}>{shortenPath(filename)}</span>
+			{/if}
 			{#if language}
 				<span class="language">{language}</span>
 			{/if}
 			<span class="stats">
-				<span class="added">+{stats.added}</span>
+				<span class="stat-added">+{stats.added}</span>
-				<span class="removed">-{stats.removed}</span>
+				<span class="stat-removed">-{stats.removed}</span>
 			</span>
 		</div>
-	{/if}
+		<div class="diff-header-right">
+			{#if diffLines.length > 20}
+				<button class="btn-toggle" onclick={() => showFullDiff = !showFullDiff}>
+					{showFullDiff ? 'Kompakt' : 'Alles zeigen'}
+				</button>
+			{/if}
+			{#if interactive}
+				<button class="btn-accept" onclick={handleAccept} title="Aenderung behalten">
+					✅ Behalten
+				</button>
+				<button class="btn-reject" onclick={handleReject} title="Aenderung rueckgaengig machen">
+					↩️ Zurueck
+				</button>
+			{/if}
+		</div>
+	</div>
 
 	<div class="diff-content">
-		{#each diffLines as line, idx (idx)}
+		{#each visibleLines as { line, idx } (idx)}
+			{@const prevIdx = visibleLines[visibleLines.indexOf({ line, idx }) - 1]?.idx}
+			{#if idx > 0 && prevIdx !== undefined && idx - prevIdx > 1}
+				<div class="diff-separator">⋯</div>
+			{/if}
 			<div class="diff-line" class:added={line.type === 'added'} class:removed={line.type === 'removed'}>
 				<span class="line-no old">{line.lineNo.old ?? ''}</span>
 				<span class="line-no new">{line.lineNo.new ?? ''}</span>
@@ -153,18 +223,42 @@
 		overflow: hidden;
 	}
 
+	.diff-view.interactive {
+		border-color: var(--accent);
+		box-shadow: 0 0 0 1px var(--accent), 0 2px 8px rgba(0, 0, 0, 0.2);
+	}
+
 	.diff-header {
 		display: flex;
 		align-items: center;
-		gap: var(--spacing-sm);
+		justify-content: space-between;
 		padding: var(--spacing-xs) var(--spacing-sm);
 		background: var(--bg-secondary);
 		border-bottom: 1px solid var(--border);
+		gap: var(--spacing-sm);
+	}
+
+	.diff-header-left {
+		display: flex;
+		align-items: center;
+		gap: var(--spacing-sm);
+		min-width: 0;
+		flex: 1;
+	}
+
+	.diff-header-right {
+		display: flex;
+		align-items: center;
+		gap: var(--spacing-xs);
+		flex-shrink: 0;
 	}
 
 	.filename {
 		font-weight: 600;
 		color: var(--text-primary);
+		overflow: hidden;
+		text-overflow: ellipsis;
+		white-space: nowrap;
 	}
 
 	.language {
@@ -176,23 +270,66 @@
 	}
 
 	.stats {
-		margin-left: auto;
 		display: flex;
 		gap: var(--spacing-xs);
 		font-size: 0.7rem;
 	}
 
-	.stats .added {
+	.stat-added { color: var(--success); }
-		color: var(--success);
+	.stat-removed { color: var(--error); }
+
+	.btn-toggle {
+		padding: 2px 6px;
+		font-size: 0.6rem;
+		background: var(--bg-tertiary);
+		border: 1px solid var(--border);
+		border-radius: var(--radius-sm);
+		color: var(--text-secondary);
+		cursor: pointer;
 	}
 
-	.stats .removed {
+	.btn-toggle:hover {
+		background: var(--bg-hover);
+		color: var(--text-primary);
+	}
+
+	.btn-accept {
+		padding: 2px 8px;
+		font-size: 0.65rem;
+		background: rgba(34, 197, 94, 0.15);
+		border: 1px solid var(--success);
+		border-radius: var(--radius-sm);
+		color: var(--success);
+		cursor: pointer;
+		font-weight: 600;
+		transition: all 0.15s;
+	}
+
+	.btn-accept:hover {
+		background: var(--success);
+		color: white;
+	}
+
+	.btn-reject {
+		padding: 2px 8px;
+		font-size: 0.65rem;
+		background: rgba(239, 68, 68, 0.1);
+		border: 1px solid var(--error);
+		border-radius: var(--radius-sm);
 		color: var(--error);
+		cursor: pointer;
+		font-weight: 600;
+		transition: all 0.15s;
+	}
+
+	.btn-reject:hover {
+		background: var(--error);
+		color: white;
 	}
 
 	.diff-content {
 		overflow-x: auto;
-		max-height: 300px;
+		max-height: 400px;
 		overflow-y: auto;
 	}
 
@@ -239,4 +376,13 @@
 		flex: 1;
 		padding-left: var(--spacing-xs);
 	}
+
+	.diff-separator {
+		text-align: center;
+		padding: 2px 0;
+		color: var(--text-secondary);
+		background: var(--bg-tertiary);
+		font-size: 0.6rem;
+		user-select: none;
+	}
 </style>

src/lib/components/FileMention.svelte

@@ -0,0 +1,169 @@
+<script lang="ts">
+	// FileMention — @-Autocomplete fuer Projekt-Dateien
+	// Trigger: @ gefolgt von mindestens 1 Zeichen im Chat-Input
+	// Fuzzy-Match gegen Dateien im Projektverzeichnis
+
+	import { invoke } from '@tauri-apps/api/core';
+
+	interface FileResult {
+		name: string;        // Dateiname
+		path: string;        // Relativer Pfad
+		full_path: string;   // Absoluter Pfad
+	}
+
+	interface Props {
+		query: string;
+		visible: boolean;
+		onSelect: (file: FileResult) => void;
+	}
+
+	let { query, visible, onSelect }: Props = $props();
+
+	let results: FileResult[] = $state([]);
+	let selectedIndex = $state(0);
+	let loading = $state(false);
+
+	// Suche triggern wenn Query sich aendert
+	$effect(() => {
+		if (visible && query.length > 0) {
+			searchFiles(query);
+		} else {
+			results = [];
+		}
+	});
+
+	async function searchFiles(q: string) {
+		loading = true;
+		try {
+			results = await invoke<FileResult[]>('fuzzy_search_files', { query: q });
+			selectedIndex = 0;
+		} catch (err) {
+			console.debug('Datei-Suche fehlgeschlagen:', err);
+			results = [];
+		}
+		loading = false;
+	}
+
+	// Keyboard-Navigation (wird von ChatPanel aufgerufen)
+	export function handleKey(event: KeyboardEvent): boolean {
+		if (!visible || results.length === 0) return false;
+
+		switch (event.key) {
+			case 'ArrowDown':
+				event.preventDefault();
+				selectedIndex = (selectedIndex + 1) % results.length;
+				return true;
+			case 'ArrowUp':
+				event.preventDefault();
+				selectedIndex = (selectedIndex - 1 + results.length) % results.length;
+				return true;
+			case 'Tab':
+			case 'Enter':
+				event.preventDefault();
+				if (results[selectedIndex]) {
+					onSelect(results[selectedIndex]);
+				}
+				return true;
+			case 'Escape':
+				event.preventDefault();
+				return true;
+		}
+		return false;
+	}
+
+	// Extension → Icon Mapping
+	function getFileIcon(name: string): string {
+		const ext = name.split('.').pop()?.toLowerCase() || '';
+		const icons: Record<string, string> = {
+			rs: '🦀', ts: '📘', js: '📙', svelte: '🟠',
+			css: '🎨', html: '🌐', json: '📋', md: '📝',
+			toml: '⚙️', yml: '📄', yaml: '📄', sql: '🗃️',
+			sh: '🐚', nix: '❄️', py: '🐍', go: '🔵',
+		};
+		return icons[ext] || '📄';
+	}
+</script>
+
+{#if visible && (results.length > 0 || loading)}
+	<div class="file-mention">
+		{#if loading && results.length === 0}
+			<div class="mention-loading">Suche...</div>
+		{/if}
+		{#each results.slice(0, 8) as file, idx (file.full_path)}
+			<!-- svelte-ignore a11y_click_events_have_key_events -->
+			<!-- svelte-ignore a11y_no_static_element_interactions -->
+			<div
+				class="mention-item"
+				class:selected={idx === selectedIndex}
+				onclick={() => onSelect(file)}
+			>
+				<span class="mention-icon">{getFileIcon(file.name)}</span>
+				<span class="mention-name">{file.name}</span>
+				<span class="mention-path">{file.path}</span>
+			</div>
+		{/each}
+	</div>
+{/if}
+
+<style>
+	.file-mention {
+		position: absolute;
+		bottom: 100%;
+		left: 0;
+		right: 0;
+		background: var(--bg-secondary);
+		border: 1px solid var(--border);
+		border-bottom: none;
+		border-radius: var(--radius-sm) var(--radius-sm) 0 0;
+		max-height: 240px;
+		overflow-y: auto;
+		box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
+		z-index: 50;
+	}
+
+	.mention-loading {
+		padding: var(--spacing-sm);
+		color: var(--text-secondary);
+		font-size: 0.7rem;
+		text-align: center;
+	}
+
+	.mention-item {
+		display: flex;
+		align-items: center;
+		gap: var(--spacing-sm);
+		padding: var(--spacing-xs) var(--spacing-sm);
+		cursor: pointer;
+		transition: background 0.1s;
+	}
+
+	.mention-item:hover,
+	.mention-item.selected {
+		background: var(--bg-hover);
+	}
+
+	.mention-item.selected {
+		border-left: 2px solid var(--accent);
+	}
+
+	.mention-icon {
+		font-size: 0.8rem;
+		flex-shrink: 0;
+	}
+
+	.mention-name {
+		font-size: 0.75rem;
+		font-weight: 600;
+		color: var(--text-primary);
+	}
+
+	.mention-path {
+		font-size: 0.6rem;
+		color: var(--text-secondary);
+		overflow: hidden;
+		text-overflow: ellipsis;
+		white-space: nowrap;
+		flex: 1;
+		text-align: right;
+	}
+</style>

src/lib/stores/app.ts

@@ -59,6 +59,18 @@ export interface QuickAction {
 	invokeArgs?: Record<string, unknown>;
 }
 
+// Pending File-Changes (Accept/Reject DiffView)
+export interface FileChange {
+	toolId: string;
+	tool: string;
+	filePath: string;
+	contentBefore: string;
+	contentAfter: string;
+	timestamp: Date;
+}
+
+export const pendingChanges = writable<FileChange[]>([]);
+
 // Stores
 export const agents = writable<Agent[]>([]);
 export const toolCalls = writable<ToolCall[]>([]);

src/lib/stores/events.ts

@@ -25,11 +25,13 @@ import {
 	loadMonitorEventsFromDb,
 	activeKnowledgeHints,
 	agentMode,
+	pendingChanges,
 	type Message,
 	type Agent,
 	type MonitorEventType,
 	type KnowledgeHint,
-	type AgentMode
+	type AgentMode,
+	type FileChange,
 } from './app';
 
 // Aktuell laufendes Tool (für inline Aktivitätsanzeige)
@@ -459,6 +461,38 @@ export async function initEventListeners(): Promise<void> {
 		})
 	);
 
+	// File-Change Events — Accept/Reject DiffView
+	listeners.push(
+		await listen<{
+			toolId: string;
+			tool: string;
+			filePath: string;
+			contentBefore: string;
+			contentAfter: string;
+		}>('file-change', (event) => {
+			const { toolId, tool, filePath, contentBefore, contentAfter } = event.payload;
+			console.log('📝 Datei-Aenderung:', filePath);
+
+			const change: FileChange = {
+				toolId,
+				tool,
+				filePath,
+				contentBefore,
+				contentAfter,
+				timestamp: new Date(),
+			};
+
+			pendingChanges.update((changes) => [...changes, change]);
+
+			addMonitorEvent('tool', `Datei geaendert: ${filePath.split('/').pop()}`, {
+				toolId,
+				tool,
+				filePath,
+				addedLines: contentAfter.split('\n').length - contentBefore.split('\n').length,
+			});
+		})
+	);
+
 	console.log('✅ Event-Listener initialisiert');
 }