feat(bisect): add guided Git bisect support

Add interactive Git bisect support to the Tauri backend and UI.
Introduce BisectState and BisectCommit types for structured state.
Expose Tauri commands to query, start, mark, and reset sessions.
Add parsers, unit tests, and a Bisect dialog with toolbar and App wiring.

- Backend: new Tauri commands, state types, and helpers to parse bisect.
- Frontend: Bisect dialog, toolbar entry, and App integration to control flow.

src/lib/components/CommandPalette.svelte

@@ -1,12 +1,12 @@
 <script lang="ts">
   import { onMount } from "svelte";
   import {
-    ArrowDownToLine, ArrowUpFromLine, Boxes, CircleHelp, FileCode, GitBranch,
+    ArrowDownToLine, ArrowUpFromLine, Boxes, Bug, CircleHelp, FileCode, GitBranch,
     GitCompare, History, RefreshCw, Search, Settings, SlidersHorizontal, Sparkles,
   } from "@lucide/svelte";
   import type { AppLanguage, GitBranch as GitBranchInfo, GitCommit, GitRepositoryFile } from "../types";
 
-  type ItemKind = "fetch" | "pull" | "push" | "refresh" | "search" | "compare" | "reflog" | "rebase" | "worktrees" | "sync" | "settings" | "ai-settings" | "help" | "branch" | "file" | "commit";
+  type ItemKind = "fetch" | "pull" | "push" | "refresh" | "search" | "compare" | "reflog" | "rebase" | "bisect" | "worktrees" | "sync" | "settings" | "ai-settings" | "help" | "branch" | "file" | "commit";
   interface Item { id: string; group: string; kind: ItemKind; title: string; subtitle: string; search: string; disabled?: boolean; run: () => void | Promise<void>; }
   interface Props {
     language: AppLanguage; hasRepository: boolean; isBusy: boolean;
@@ -17,7 +17,7 @@
     onSelectCommit: (commit: GitCommit) => void | Promise<void>;
     onFetch: () => void | Promise<void>; onPull: () => void | Promise<void>; onPush: () => void | Promise<void>;
     onRefresh: () => void | Promise<void>; onOpenSearch: () => void; onOpenCompare: () => void;
-    onOpenReflog: () => void | Promise<void>; onOpenInteractiveRebase: () => void;
+    onOpenReflog: () => void | Promise<void>; onOpenInteractiveRebase: () => void; onOpenBisect: () => void | Promise<void>;
     onOpenWorktrees: () => void | Promise<void>; onOpenSyncSettings: () => void | Promise<void>;
     onOpenSettings: () => void; onOpenAiSettings: () => void; onOpenHelp: () => void;
   }
@@ -26,7 +26,7 @@
     language = "en", hasRepository = false, isBusy = false, branches = [], files = [], commits = [], onClose = () => {},
     onCheckoutBranch = () => {}, onOpenFile = () => {}, onSelectCommit = () => {}, onFetch = () => {}, onPull = () => {},
     onPush = () => {}, onRefresh = () => {}, onOpenSearch = () => {}, onOpenCompare = () => {}, onOpenReflog = () => {},
-    onOpenInteractiveRebase = () => {}, onOpenWorktrees = () => {}, onOpenSyncSettings = () => {}, onOpenSettings = () => {},
+    onOpenInteractiveRebase = () => {}, onOpenBisect = () => {}, onOpenWorktrees = () => {}, onOpenSyncSettings = () => {}, onOpenSettings = () => {},
     onOpenAiSettings = () => {}, onOpenHelp = () => {},
   }: Props = $props();
 
@@ -50,6 +50,7 @@
     action("compare", "compare", isGerman ? "Branches oder Commits vergleichen" : "Compare branches or commits", isGerman ? "Zwei vollständige Revisionen vergleichen" : "Diff two complete revisions", onOpenCompare),
     action("reflog", "reflog", "Reflog", isGerman ? "Verlorene Commits finden und wiederherstellen" : "Find and recover lost commits", onOpenReflog),
     action("rebase", "rebase", "Interactive Rebase", isGerman ? "Commit-Historie bearbeiten" : "Edit commit history", onOpenInteractiveRebase),
+    action("bisect", "bisect", "Git Bisect", isGerman ? "Fehlerhaften Commit schrittweise finden" : "Find a bad commit step by step", onOpenBisect),
     action("worktrees", "worktrees", "Worktrees", isGerman ? "Arbeitsverzeichnisse verwalten" : "Manage linked working trees", onOpenWorktrees),
     action("sync", "sync", isGerman ? "Synchronisierung konfigurieren" : "Configure synchronization", isGerman ? "Remote, Upstream und Pull-Strategie" : "Remote, upstream and pull strategy", onOpenSyncSettings),
     action("settings", "settings", isGerman ? "Einstellungen" : "Settings", isGerman ? "Darstellung, Sprache und Verhalten" : "Appearance, language and behavior", onOpenSettings, false),
@@ -118,6 +119,7 @@
               {:else if item.kind === "compare"}<GitCompare size={16} />
               {:else if item.kind === "reflog" || item.kind === "commit"}<History size={16} />
               {:else if item.kind === "rebase" || item.kind === "branch"}<GitBranch size={16} />
+              {:else if item.kind === "bisect"}<Bug size={16} />
               {:else if item.kind === "worktrees"}<Boxes size={16} />
               {:else if item.kind === "sync"}<SlidersHorizontal size={16} />
               {:else if item.kind === "settings"}<Settings size={16} />