feat: Chat-Panel herausloesbar + Expand-Button Fix [appimage]

- Neues Fenster fuer Chat-Panel (auf zweiten Monitor ziehbar)
- Expand/Collapse nutzt jetzt $state Array statt Set (Svelte 5 Reaktivitaet)
- Kein Collapse waehrend Streaming (verhindert unklickbare Buttons)

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

src-tauri/src/chat_window.rs

@@ -0,0 +1,31 @@
+// Claude Desktop — Chat-Fenster herauslösen
+// Öffnet den Chat-Panel in einem separaten Fenster
+
+use tauri::{AppHandle, Manager, WebviewUrl, WebviewWindowBuilder};
+
+#[tauri::command]
+pub async fn chat_window_open(app: AppHandle) -> Result<(), String> {
+    if let Some(win) = app.get_webview_window("chat-detached") {
+        win.show().map_err(|e| e.to_string())?;
+        win.set_focus().map_err(|e| e.to_string())?;
+        return Ok(());
+    }
+
+    WebviewWindowBuilder::new(&app, "chat-detached", WebviewUrl::App("/chat-window".into()))
+        .title("Claude \u{2014} Chat")
+        .inner_size(800.0, 900.0)
+        .min_inner_size(500.0, 400.0)
+        .center()
+        .build()
+        .map_err(|e| e.to_string())?;
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn chat_window_close(app: AppHandle) -> Result<(), String> {
+    if let Some(win) = app.get_webview_window("chat-detached") {
+        win.close().map_err(|e| e.to_string())?;
+    }
+    Ok(())
+}

src-tauri/src/lib.rs

@@ -23,6 +23,7 @@ mod session;
 mod teaching;
 mod update;
 mod voice;
+mod chat_window;
 
 /// Initialisiert die App
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
@@ -145,6 +146,9 @@ pub fn run() {
             teaching::presentation_close,
             teaching::presentation_send_slide,
             teaching::presentation_clear,
+            // Chat-Fenster (herauslösen)
+            chat_window::chat_window_open,
+            chat_window::chat_window_close,
             // Auto-Update
             update::check_for_update,
             update::download_update,

src/lib/components/ChatPanel.svelte

@@ -7,6 +7,9 @@
 	import { get } from 'svelte/store';
 	import CommandPalette from './CommandPalette.svelte';
 
+	// Props
+	let { detached = false }: { detached?: boolean } = $props();
+
 	// Input-Referenz für Focus-Shortcuts
 	let inputTextarea: HTMLTextAreaElement;
 
@@ -25,15 +28,14 @@
 
 	// Collapse: Nachrichten mit > 25 Zeilen werden eingeklappt
 	const COLLAPSE_LINES = 25;
-	let expandedMessages = new Set<string>();
+	let expandedMessages = $state<string[]>([]);
 
 	function toggleExpand(msgId: string) {
-		if (expandedMessages.has(msgId)) {
+		if (expandedMessages.includes(msgId)) {
-			expandedMessages.delete(msgId);
+			expandedMessages = expandedMessages.filter(id => id !== msgId);
 		} else {
-			expandedMessages.add(msgId);
+			expandedMessages = [...expandedMessages, msgId];
 		}
-		expandedMessages = expandedMessages;
 	}
 
 	function shouldCollapse(content: string): boolean {
@@ -819,6 +821,11 @@
 			<span class="token-count" class:warning={estimatedTokens > 20000} class:danger={estimatedTokens > TOKEN_WARNING_THRESHOLD}>
 				~{(estimatedTokens / 1000).toFixed(1)}k Token
 			</span>
+			{#if !detached}
+				<button class="detach-btn" onclick={() => invoke('chat_window_open')} title="Chat herausloesen">&#x29C9;</button>
+			{:else}
+				<button class="detach-btn" onclick={() => invoke('chat_window_close')} title="Zurueck ins Hauptfenster">&#x29C7;</button>
+			{/if}
 		</div>
 	</div>
 
@@ -878,7 +885,7 @@
 							</div>
 						{:else if message.role === 'assistant'}
 							{#if message.content}
-								{#if shouldCollapse(message.content) && !expandedMessages.has(message.id)}
+								{#if shouldCollapse(message.content) && !expandedMessages.includes(message.id) && !($isProcessing && isLastAssistantMessage(index))}
 									<div class="msg-collapsed">
 										{@html renderMarkdown(message.content.split('\n').slice(0, COLLAPSE_LINES).join('\n') + '\n...')}
 									</div>
@@ -887,7 +894,7 @@
 									</button>
 								{:else}
 									{@html renderMarkdown(message.content)}
-									{#if shouldCollapse(message.content)}
+									{#if shouldCollapse(message.content) && !($isProcessing && isLastAssistantMessage(index))}
 										<button class="expand-btn" onclick={() => toggleExpand(message.id)}>
 											▲ Einklappen
 										</button>
@@ -1154,6 +1161,24 @@
 		color: var(--error);
 	}
 
+	.detach-btn {
+		padding: 0.2rem 0.45rem;
+		background: var(--bg-tertiary, #2a2a3e);
+		border: 1px solid var(--border, #333);
+		border-radius: var(--radius-sm, 4px);
+		color: var(--text-secondary, #aaa);
+		cursor: pointer;
+		font-size: 0.85rem;
+		line-height: 1;
+		transition: all 0.15s ease;
+	}
+
+	.detach-btn:hover {
+		background: var(--accent, #6c8aff);
+		color: white;
+		border-color: var(--accent, #6c8aff);
+	}
+
 	.chat-messages {
 		flex: 1;
 		overflow-y: auto;

src/routes/chat-window/+page.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+	import ChatPanel from '$lib/components/ChatPanel.svelte';
+	import { onMount } from 'svelte';
+
+	onMount(() => {
+		document.documentElement.classList.add('detached-window');
+	});
+</script>
+
+<div class="detached-chat">
+	<ChatPanel detached={true} />
+</div>
+
+<style>
+	:global(html.detached-window) {
+		background: var(--bg-primary, #1a1a2e);
+	}
+
+	.detached-chat {
+		height: 100vh;
+		width: 100vw;
+		display: flex;
+		flex-direction: column;
+		overflow: hidden;
+	}
+</style>