feat: show changed files after completed turns

Add changed-file pills with per-file diff stats
Add a chat setting to disable the feature fully
Avoid changed-file projection work when disabled

packages/ui/src/stores/useUIStore.ts

@@ -605,6 +605,7 @@ interface UIStore {
   inputSpellcheckEnabled: boolean;
   wideChatLayoutEnabled: boolean;
   showToolFileIcons: boolean;
+  showTurnChangedFiles: boolean;
   showExpandedBashTools: boolean;
   showExpandedEditTools: boolean;
   timeFormatPreference: TimeFormatPreference;
@@ -743,6 +744,7 @@ interface UIStore {
   setInputSpellcheckEnabled: (value: boolean) => void;
   setWideChatLayoutEnabled: (value: boolean) => void;
   setShowToolFileIcons: (value: boolean) => void;
+  setShowTurnChangedFiles: (value: boolean) => void;
   setShowExpandedBashTools: (value: boolean) => void;
   setShowExpandedEditTools: (value: boolean) => void;
   setTimeFormatPreference: (value: TimeFormatPreference) => void;
@@ -876,6 +878,7 @@ export const useUIStore = create<UIStore>()(
         inputSpellcheckEnabled: false,
         wideChatLayoutEnabled: false,
         showToolFileIcons: true,
+        showTurnChangedFiles: false,
         showExpandedBashTools: false,
         showExpandedEditTools: false,
         timeFormatPreference: 'auto',
@@ -1942,6 +1945,9 @@ export const useUIStore = create<UIStore>()(
         setShowToolFileIcons: (value) => {
           set({ showToolFileIcons: value });
         },
+        setShowTurnChangedFiles: (value) => {
+          set({ showTurnChangedFiles: value });
+        },
         setShowExpandedBashTools: (value) => {
           set({ showExpandedBashTools: value });
         },
@@ -2183,6 +2189,7 @@ export const useUIStore = create<UIStore>()(
           inputSpellcheckEnabled: state.inputSpellcheckEnabled,
           wideChatLayoutEnabled: state.wideChatLayoutEnabled,
           showToolFileIcons: state.showToolFileIcons,
+          showTurnChangedFiles: state.showTurnChangedFiles,
           showExpandedBashTools: state.showExpandedBashTools,
           showExpandedEditTools: state.showExpandedEditTools,
           timeFormatPreference: state.timeFormatPreference,