Resizable Panels — alle Bereiche per Drag ziehbar

- 3 Resize-Handles zwischen den 4 Panels (Session/Chat/Aktivität/Agents)
- Mindestbreite 120px pro Panel
- Panel-Breiten werden in localStorage gespeichert und beim Neustart geladen
- Visuelles Feedback: Handle wird blau beim Hover/Drag

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/routes/+page.svelte

@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { onMount } from 'svelte';
 	import SessionList from '$lib/components/SessionList.svelte';
 	import ChatPanel from '$lib/components/ChatPanel.svelte';
 	import ActivityPanel from '$lib/components/ActivityPanel.svelte';
@@ -7,10 +8,7 @@
 	import AuditLog from '$lib/components/AuditLog.svelte';
 	import GuardRailsPanel from '$lib/components/GuardRailsPanel.svelte';
 
-	// Tab-State für mittleres Panel
 	let activeMiddleTab = 'activity';
-
-	// Tab-State für rechtes Panel
 	let activeRightTab = 'agents';
 
 	const middleTabs = [
@@ -23,20 +21,111 @@
 		{ id: 'agents', label: 'Agents', icon: '🤖' },
 		{ id: 'guards', label: 'Guard-Rails', icon: '🛡️' },
 	];
+
+	// ============ Resizable Panels ============
+
+	// Breiten in Pixel (werden zu fr umgerechnet)
+	let panelWidths = [220, 400, 400, 380];
+	let container: HTMLDivElement;
+	let dragging: number | null = null;
+	let startX = 0;
+	let startWidths: number[] = [];
+
+	function getGridTemplate(): string {
+		return panelWidths.map(w => `${w}px`).join(' ');
+	}
+
+	function onMouseDown(index: number, event: MouseEvent) {
+		event.preventDefault();
+		dragging = index;
+		startX = event.clientX;
+		startWidths = [...panelWidths];
+		window.addEventListener('mousemove', onMouseMove);
+		window.addEventListener('mouseup', onMouseUp);
+	}
+
+	function onMouseMove(event: MouseEvent) {
+		if (dragging === null) return;
+		const dx = event.clientX - startX;
+		const minWidth = 120;
+
+		const leftIdx = dragging;
+		const rightIdx = dragging + 1;
+
+		let newLeft = startWidths[leftIdx] + dx;
+		let newRight = startWidths[rightIdx] - dx;
+
+		// Mindestbreiten einhalten
+		if (newLeft < minWidth) {
+			newRight -= (minWidth - newLeft);
+			newLeft = minWidth;
+		}
+		if (newRight < minWidth) {
+			newLeft -= (minWidth - newRight);
+			newRight = minWidth;
+		}
+
+		panelWidths[leftIdx] = Math.max(minWidth, newLeft);
+		panelWidths[rightIdx] = Math.max(minWidth, newRight);
+		panelWidths = panelWidths; // Svelte reactivity
+	}
+
+	function onMouseUp() {
+		dragging = null;
+		window.removeEventListener('mousemove', onMouseMove);
+		window.removeEventListener('mouseup', onMouseUp);
+
+		// Breiten in localStorage speichern
+		try {
+			localStorage.setItem('panel-widths', JSON.stringify(panelWidths));
+		} catch {}
+	}
+
+	onMount(() => {
+		// Gespeicherte Breiten laden
+		try {
+			const saved = localStorage.getItem('panel-widths');
+			if (saved) {
+				const parsed = JSON.parse(saved);
+				if (Array.isArray(parsed) && parsed.length === 4) {
+					panelWidths = parsed;
+				}
+			}
+		} catch {}
+
+		// Initiale Breiten an Fenster anpassen wenn zu breit
+		if (container) {
+			const total = panelWidths.reduce((a, b) => a + b, 0);
+			const available = container.clientWidth - 9; // 3 Handles à 3px
+			if (total > available) {
+				const scale = available / total;
+				panelWidths = panelWidths.map(w => Math.round(w * scale));
+			}
+		}
+	});
 </script>
 
-<div class="panels">
+<div
-	<!-- Session-Sidebar (links) -->
+	class="panels"
+	class:dragging={dragging !== null}
+	bind:this={container}
+	style="grid-template-columns: {getGridTemplate()}"
+>
+	<!-- Session-Sidebar -->
 	<aside class="panel panel-sessions">
 		<SessionList />
 	</aside>
 
-	<!-- Chat (Mitte-Links) -->
+	<div class="resize-handle" on:mousedown={(e) => onMouseDown(0, e)} role="separator" aria-orientation="vertical"></div>
+
+	<!-- Chat -->
 	<section class="panel panel-chat">
 		<ChatPanel />
 	</section>
 
-	<!-- Aktivität / Memory / Audit (Mitte-Rechts) -->
+	<div class="resize-handle" on:mousedown={(e) => onMouseDown(1, e)} role="separator" aria-orientation="vertical"></div>
+
+	<!-- Aktivität / Memory / Audit -->
 	<section class="panel panel-activity">
 		<div class="panel-tabs">
 			{#each middleTabs as tab}
@@ -60,7 +149,9 @@
 		</div>
 	</section>
 
-	<!-- Agents / Guard-Rails (rechts) -->
+	<div class="resize-handle" on:mousedown={(e) => onMouseDown(2, e)} role="separator" aria-orientation="vertical"></div>
+
+	<!-- Agents / Guard-Rails -->
 	<section class="panel panel-details">
 		<div class="panel-tabs">
 			{#each rightTabs as tab}
@@ -86,10 +177,14 @@
 <style>
 	.panels {
 		display: grid;
-		grid-template-columns: 220px 1fr 1fr 1fr;
+		gap: 0;
-		gap: 1px;
 		height: 100%;
-		background: var(--border);
+		background: var(--bg-primary);
+	}
+
+	.panels.dragging {
+		cursor: col-resize;
+		user-select: none;
 	}
 
 	.panel {
@@ -97,12 +192,24 @@
 		flex-direction: column;
 		background: var(--bg-primary);
 		overflow: hidden;
+		min-width: 0;
 	}
 
-	.panel-sessions {
+	/* Resize Handle */
-		min-width: 180px;
+	.resize-handle {
+		width: 3px;
+		cursor: col-resize;
+		background: var(--border);
+		transition: background 0.15s ease;
+		z-index: 10;
 	}
 
+	.resize-handle:hover,
+	.panels.dragging .resize-handle {
+		background: var(--accent);
+	}
+
+	/* Tabs */
 	.panel-tabs {
 		display: flex;
 		background: var(--bg-secondary);
@@ -136,32 +243,4 @@
 		flex: 1;
 		overflow: auto;
 	}
-
-	/* Responsive */
-	@media (max-width: 1400px) {
-		.panels {
-			grid-template-columns: 200px 1fr 1fr;
-		}
-		.panel-details {
-			display: none;
-		}
-	}
-
-	@media (max-width: 1000px) {
-		.panels {
-			grid-template-columns: 180px 1fr;
-		}
-		.panel-activity {
-			display: none;
-		}
-	}
-
-	@media (max-width: 700px) {
-		.panels {
-			grid-template-columns: 1fr;
-		}
-		.panel-sessions {
-			display: none;
-		}
-	}
 </style>