feat: show file change summary bar (#950)

* feat: add FileChangeSummary component for multi-file diff preview in ToolPart

Provides an aggregated diff card for apply_patch and multi-edit tools,
showing per-file stats with click-to-expand diff view.

* feat: add PendingChangesBar above chat input with collapse/expand and file opening

- Collapsed/expanded toggle with aggregate +N -N stats (green/red)
- Relative path display, chat-column alignment with ChatInput
- Click file to open in diff viewer (web/desktop) or editor (VS Code)
- Support edit/multiedit/apply_patch/write tool metadata extraction
- Add PendingChangesBar to main chat view (ChatContainer)

* feat: dual-mode ChangedFilesBar — Git diff state vs latest AI turn

Git mode: reads git status from useGitStore (status.files + diffStats),
auto-clears on commit/restore. Shows 'N files changed in workspace'.

Non-Git mode: latest assistant turn only (no accumulation), clears on new
user message or manual dismiss. Shows 'AI updated N files in the last reply'.

Both modes: dismiss button with signature-based tracking.
Add pendingChangesBarDismissed state to session-ui-store, cleared on sendMessage.

* fix: address code review issues in ChangedFilesBar

- Gate non-git mode on streaming state to prevent flicker during AI turns
- Return null when isGitRepo is unknown (loading state)
- Add group/row class for reject button visibility in FileChangeSummary
- Use per-session Map for dismiss tracking to prevent cross-session leaks
- Include additions/deletions in dismiss signature for re-edit detection
- Extract shared parsePatchStats/parseCount to fileChangeHelpers

* chore: revert local .opencode/package-lock.json changes from PR

* fix: per-part fallback guard and git-only reject button

- Fix extractChangedFiles to use per-part files.length snapshot instead
  of global guard, preventing file entries from being skipped when
  earlier parts already contributed files
- Hide reject button in FileChangeSummary when not in a git repo,
  preventing silent revert failures

* refactor: remove FileChangeSummary — dead code redundant with ToolPart

FileChangeSummary duplicated diff rendering that ToolPart already
provides (PatchDiff, per-file stats, DiffViewToggle). The only unique
feature was a git revert button, which conflicts with the design
principle of not having accept/reject on file change previews.

Moved parsePatchStats/parseCount back into PendingChangesBar (sole
consumer) and deleted the shared helper module.

* chore: remove stray Tester.txt

* fix: deduplicate Fallback 4 'Diff' placeholder via seen set

* chore: update non-Git mode copy to neutral 'changed in the last reply'

* fix(chat): unify changes row with tasks

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/sync/session-ui-store.ts

@@ -187,6 +187,10 @@ export type SessionUIState = {
   markSessionPlanAvailable: (sessionId: string) => void
   isSessionPlanAvailable: (sessionId: string) => boolean
 
+  // Non-Git mode: dismissed signature hash per session, hides bar until new turn arrives
+  pendingChangesBarDismissed: Map<string, string>
+  dismissPendingChangesBar: (sessionId: string, signature: string | null) => void
+
   // Actions — UI state management
   setCurrentSession: (id: string | null, directoryHint?: string | null) => void
   openNewSessionDraft: (options?: Partial<NewSessionDraftState>) => void
@@ -343,6 +347,7 @@ export const useSessionUIStore = create<SessionUIState>()((set, get) => ({
   isLoading: false,
   lastLoadedDirectory: null,
   sessionPlanAvailable: new Map(),
+  pendingChangesBarDismissed: new Map(),
 
   // ---------------------------------------------------------------------------
   // setCurrentSession
@@ -650,6 +655,16 @@ export const useSessionUIStore = create<SessionUIState>()((set, get) => ({
 
   getWorktreeMetadata: (sessionId) => get().worktreeMetadata.get(sessionId),
 
+  dismissPendingChangesBar: (sessionId, signature) => {
+    const map = new Map(get().pendingChangesBarDismissed);
+    if (signature === null) {
+      map.delete(sessionId);
+    } else {
+      map.set(sessionId, signature);
+    }
+    set({ pendingChangesBarDismissed: map });
+  },
+
   // ---------------------------------------------------------------------------
   // sendMessage — calls SDK, reads domain data from sync
   // ---------------------------------------------------------------------------
@@ -664,6 +679,14 @@ export const useSessionUIStore = create<SessionUIState>()((set, get) => ({
     variant?: string,
     inputMode?: "normal" | "shell",
   ) => {
+    // Clear non-Git changed-files bar on new user message for current session
+    const sid = get().currentSessionId;
+    if (sid) {
+      const map = new Map(get().pendingChangesBarDismissed);
+      map.delete(sid);
+      set({ pendingChangesBarDismissed: map });
+    }
+
     const draft = get().newSessionDraft
     const trimmedAgent = typeof agent === "string" && agent.trim().length > 0 ? agent.trim() : undefined
 

packages/ui/src/sync/sync-context.tsx

@@ -27,6 +27,7 @@ import { syncDebug } from "./debug"
 import { opencodeClient } from "@/lib/opencode/client"
 import { usePermissionStore } from "@/stores/permissionStore"
 import { useConfigStore } from "@/stores/useConfigStore"
+import { useTodosPersistStore } from "@/stores/useTodosPersistStore"
 import { toast } from "@/components/ui"
 import { appendNotification } from "./notification-store"
 import type { State } from "./types"
@@ -1159,7 +1160,11 @@ function handleEvent(
       break
   }
 
-  if (applyDirectoryEvent(draft, payload)) {
+  if (applyDirectoryEvent(draft, payload, {
+    onSetSessionTodo: (sessionID, todos) => {
+      useTodosPersistStore.getState().setSessionTodos(sessionID, todos)
+    },
+  })) {
     store.setState(draft)
     const sessionID = getSessionIdFromPayload(payload) ?? undefined
     const messageID = getMessageIdFromPayload(payload) ?? undefined