…ko-KR, tr-TR

…t snapshot service

- Add WorkspaceSnapshotService with dual-mode support:
  - git-repo mode: reuse existing .git, read branch name, compare against HEAD
  - snapshot mode: create isolated gitdir in temp dir for workspaces without .git
- Use git.walk with content hashing to bypass "racy git" stat-cache issue
- Replace IPC emitter with 5 providers: init/compare/getBaselineContent/getInfo/dispose
- Rewrite useFileChanges hook for on-demand comparison instead of real-time events
- Update FileChangeList: lazy diff loading, refresh button, loading state
- Update WorkspaceTabBar: display current branch name for git-repo mode
- Remove old snapshot interception code from fsBridge.ts
- Add isomorphic-git dependency
- Add i18n refresh key to all 6 locales
- 19 unit tests passing

…or compare

git.walk reads every file's content into memory and computes SHA-1 hashes,
causing 17GB memory usage on large workspaces. statusMatrix uses stat-based
comparison (mtime + size) which is O(n) stat calls with no file content reads.

…service

isomorphic-git reads every file's content and computes SHA-1 hashes in JS,
causing 78s latency and 862MB memory for 1829 files (17GB in real workspace).

Native git via child_process: 91ms total, 2.6MB memory — 857x faster.

- Use git diff --name-status + git ls-files for compare()
- Use git show <ref>:<path> for getBaselineContent()
- Use git init --bare + git add/commit for snapshot mode
- Remove isomorphic-git dependency

Previously git-repo mode used HEAD commit as baseline, showing ALL
uncommitted changes (possibly from days ago). Now both modes create
a temp gitdir snapshot of the current working tree at conversation start,
so only changes made DURING the conversation are shown.

Redesign Changes tab to show two collapsible sections like VS Code:
- Staged Changes: files added to git index
- Changes (unstaged): modified/new/deleted files

Git-repo mode supports: stage, stage all, unstage, unstage all, discard
Snapshot mode shows flat list with reset (revert) action

- Add stageFile/stageAll/unstageFile/unstageAll/discardFile/resetFile
  to WorkspaceSnapshotService, IPC bridge, and useFileChanges hook
- Parse git status --porcelain for staged/unstaged separation
- Git-repo mode now uses real .git (no temp gitdir), compare via
  git status instead of snapshot baseline
- Snapshot mode keeps temp gitdir for conversation-scoped changes
- FileChangeList shows hover action buttons per file
- Add i18n keys for all 6 locales

Replace collapsible sections with fixed two-panel split:
- Top panel: unstaged changes with stage/discard actions
- Bottom panel: staged changes with unstage action
- Each panel has its own header bar and scrollable file list
- Empty state text when a panel has no files
- Snapshot mode: single flat panel (no staging concept)

Split refresh into two functions:
- silentRefresh: updates data without loading spinner (git operations)
- refreshChanges: shows loading indicator (manual refresh button)

Stage/unstage/discard/reset now use silentRefresh so panels stay
visible during the data update instead of flashing to a spinner.

- Add getBranches service method using git branch --format
- Wire IPC bridge and provider for branch listing
- Fetch branches after init in git-repo mode
- Display branches in a read-only Tree dropdown with folder grouping
- Current branch highlighted with check icon, ancestors auto-expanded

- Remove Arco Tree dependency for branch dropdown
- Use lightweight recursive BranchList component with 12px indent
- Fix folder key uniqueness issue causing broken layout on click
- Fix branch trigger width to 100px to prevent TabBar layout shift
- Use var(--color-bg-popup) for solid dropdown background

…moteAgent bridges