feat: add manual chat title regeneration (#23633)

## Summary

Adds a "Generate new title" action that lets users manually regenerate a
chat's title using richer conversation context than the automatic
first-message title path.

## Changes

### Backend
- **New endpoint:** `POST
/api/experimental/chats/{chatID}/title/regenerate` returns the updated
Chat with a regenerated title
- **Manual title algorithm:** Extracts useful user/assistant text turns
→ selects first user turn + last 3 turns → builds context with gap
markers → renders prompt with anti-recency guidance → calls lightweight
model → normalizes output
- **Helpers:** `extractManualTitleTurns`,
`selectManualTitleTurnIndexes`, `buildManualTitleContext`,
`renderManualTitlePrompt`, `generateManualTitle` — all private, with the
public `Server.RegenerateChatTitle` method
- **SDK:** `ExperimentalClient.RegenerateChatTitle(ctx, chatID) (Chat,
error)`
- Persists title via existing `UpdateChatByID` and broadcasts
`ChatEventKindTitleChange`

### Frontend
- API client method + React Query mutation with cache invalidation
- "Generate new title" menu item (with wand icon) in both TopBar and
Sidebar dropdown menus
- Loading/disabled state while regeneration is in-flight
- Error toast on failure
- Stories updated for both menus

### Tests
- `quickgen_test.go`: Table-driven tests for all 4 helper functions
(turn extraction, index selection, context building, prompt rendering)
- `exp_chats_test.go`: Handler tests (ChatNotFound,
NotFoundForDifferentUser, NoDaemon)

## Design notes
- The existing auto-title path (`maybeGenerateChatTitle`, `titleInput`)
is completely unchanged
- Manual regeneration uses richer context (first user turn + last 3
turns + gap markers) vs the auto path's single first message
- Endpoint is experimental and marked with `@x-apidocgen {"skip": true}`

codersdk/chats.go

@@ -1870,6 +1870,21 @@ func (c *ExperimentalClient) InterruptChat(ctx context.Context, chatID uuid.UUID
 	return chat, json.NewDecoder(res.Body).Decode(&chat)
 }
 
+// RegenerateChatTitle requests the server to regenerate the chat's
+// title using richer conversation context.
+func (c *ExperimentalClient) RegenerateChatTitle(ctx context.Context, chatID uuid.UUID) (Chat, error) {
+	res, err := c.Request(ctx, http.MethodPost, fmt.Sprintf("/api/experimental/chats/%s/title/regenerate", chatID), nil)
+	if err != nil {
+		return Chat{}, err
+	}
+	defer res.Body.Close()
+	if res.StatusCode != http.StatusOK {
+		return Chat{}, readBodyAsChatUsageLimitError(res)
+	}
+	var chat Chat
+	return chat, json.NewDecoder(res.Body).Decode(&chat)
+}
+
 // GetChatGitChanges returns git changes for a chat.
 func (c *ExperimentalClient) GetChatGitChanges(ctx context.Context, chatID uuid.UUID) ([]ChatGitChange, error) {
 	res, err := c.Request(ctx, http.MethodGet, fmt.Sprintf("/api/experimental/chats/%s/git-changes", chatID), nil)