feat(electrobun): groups, cloning, shortcuts, custom window — all 5 features

Groups Sidebar:
- SQLite groups table (4 seeded: Development, Testing, DevOps, Research)
- Left icon rail with emoji group icons, Ctrl+1-4 switching
- Active group highlighted, projects filtered by group

Project Cloning:
- Clone button on project cards (fork icon)
- git worktree add via Bun.spawn (array form, no shell strings)
- 3-clone limit, branch name validation, pending-status pattern
- Clone cards: WT badge + branch name + accent top border
- Chain link SVG icons between linked clones in grid

Keyboard Shortcuts:
- keybinding-store.svelte.ts: 16 defaults across 4 categories
- Two-scope: document capture + terminal focus guard
- KeyboardSettings.svelte: search, click-to-capture, conflict detection
- Per-binding reset + Reset All

Custom Window:
- titleBarStyle: "hidden" — no native title bar
- Vertical "AGOR" text in left sidebar (writing-mode: vertical-rl)
- Floating window controls badge (minimize/maximize/close)
- Draggable region via -webkit-app-region: drag
- Window frame persisted to SQLite (debounced 500ms)

Window is resizable by default (Electrobun BrowserWindow).

ui-electrobun/src/shared/pty-rpc-schema.ts

@@ -89,6 +89,63 @@ export type PtyRPCRequests = {
     params: { id: string };
     response: { ok: boolean };
   };
+
+  // ── Groups RPC ─────────────────────────────────────────────────────────────
+
+  /** Return all project groups. */
+  "groups.list": {
+    params: Record<string, never>;
+    response: { groups: Array<{ id: string; name: string; icon: string; position: number }> };
+  };
+
+  // ── Project clone RPC ──────────────────────────────────────────────────────
+
+  /** Clone a project into a git worktree. branchName must match /^[a-zA-Z0-9\/_.-]+$/. */
+  "project.clone": {
+    params: { projectId: string; branchName: string };
+    response: { ok: boolean; project?: { id: string; config: string }; error?: string };
+  };
+
+  // ── Window control RPC ─────────────────────────────────────────────────────
+
+  /** Minimize the main window. */
+  "window.minimize": {
+    params: Record<string, never>;
+    response: { ok: boolean };
+  };
+  /** Toggle maximize/restore on the main window. */
+  "window.maximize": {
+    params: Record<string, never>;
+    response: { ok: boolean };
+  };
+  /** Close the main window. */
+  "window.close": {
+    params: Record<string, never>;
+    response: { ok: boolean };
+  };
+  /** Get current window frame (x, y, width, height). */
+  "window.getFrame": {
+    params: Record<string, never>;
+    response: { x: number; y: number; width: number; height: number };
+  };
+
+  // ── Keybindings RPC ────────────────────────────────────────────────────────
+
+  /** Return all persisted custom keybindings (overrides only). */
+  "keybindings.getAll": {
+    params: Record<string, never>;
+    response: { keybindings: Record<string, string> };
+  };
+  /** Persist a single keybinding override. */
+  "keybindings.set": {
+    params: { id: string; chord: string };
+    response: { ok: boolean };
+  };
+  /** Reset a keybinding to default (removes override). */
+  "keybindings.reset": {
+    params: { id: string };
+    response: { ok: boolean };
+  };
 };
 
 // ── Messages (Bun → WebView, fire-and-forget) ────────────────────────────────