fix: resolve temp file leaks, HljsDiff virtualization bugs, and tighten credential dir permissions

desktop/build/windows/installer/project.nsi

@@ -153,7 +153,8 @@ Section "uninstall"
 
     RMDir /r "$AppData\${PRODUCT_EXECUTABLE}" # Remove the WebView2 DataPath
 
-    RMDir /r $INSTDIR
+    ; Precision uninstall: delete main application files
+    Delete "$INSTDIR\${PRODUCT_EXECUTABLE}"
 
     Delete "$SMPROGRAMS\${INFO_PRODUCTNAME}.lnk"
     Delete "$DESKTOP\${INFO_PRODUCTNAME}.lnk"
@@ -162,4 +163,7 @@ Section "uninstall"
     !insertmacro wails.unassociateCustomProtocols
 
     !insertmacro reasonix.deleteUninstaller
+
+    ; Only remove the installation directory if it is empty to prevent data loss
+    RMDir $INSTDIR
 SectionEnd

desktop/frontend/src/App.tsx

@@ -1532,16 +1532,24 @@ export default function App() {
         if (isThemeMode(arg)) {
           const next = arg;
           const style = getThemeStyle(next);
-          await app.SetDesktopAppearance(next, style);
-          applyTheme(next, style);
-          notice(t("settings.themeChanged", { theme: next, style }));
+          try {
+            await app.SetDesktopAppearance(next, style);
+            applyTheme(next, style);
+            notice(t("settings.themeChanged", { theme: next, style }));
+          } catch (err) {
+            showToast(err instanceof Error ? err.message : String(err), "error");
+          }
           return;
         }
         if (isThemeStyle(arg)) {
           const cur = getTheme();
-          await app.SetDesktopAppearance(cur, arg);
-          applyTheme(cur, arg);
-          notice(t("settings.themeChanged", { theme: cur, style: arg }));
+          try {
+            await app.SetDesktopAppearance(cur, arg);
+            applyTheme(cur, arg);
+            notice(t("settings.themeChanged", { theme: cur, style: arg }));
+          } catch (err) {
+            showToast(err instanceof Error ? err.message : String(err), "error");
+          }
           return;
         }
         notice(t("settings.themeUnknown", { name: arg }), "warn");
@@ -1553,7 +1561,7 @@ export default function App() {
       if (goal.trim()) await setControllerGoal(goal);
       commitThenSend(trimmed, submitText.trim());
     },
-    [applyGoal, closeTransientOverlays, collaborationMode, composerProfile, goal, send, runShell, notice, setControllerCollaborationMode, setControllerGoal, setControllerToolApprovalMode, steer, switchModel, t, toolApprovalMode],
+    [applyGoal, closeTransientOverlays, collaborationMode, composerProfile, goal, send, runShell, notice, setControllerCollaborationMode, setControllerGoal, setControllerToolApprovalMode, steer, switchModel, t, toolApprovalMode, showToast],
   );
 
   const refreshTabMetas = useCallback(async (): Promise<TabMeta[]> => {
@@ -2283,9 +2291,13 @@ export default function App() {
   const renameTopic = useCallback(async (topicId: string, title: string) => {
     const nextTitle = title.trim();
     if (!topicId || !nextTitle) return;
-    await app.RenameTopic(topicId, nextTitle);
-    await refreshProjectsAndTabs();
-  }, [refreshProjectsAndTabs]);
+    try {
+      await app.RenameTopic(topicId, nextTitle);
+      await refreshProjectsAndTabs();
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
+    }
+  }, [refreshProjectsAndTabs, showToast]);
 
   const startActiveTopicRename = useCallback(() => {
     if (!activeTab?.topicId) return;

desktop/frontend/src/components/ProjectTree.tsx

@@ -6,6 +6,7 @@ import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import type { CSSProperties, DragEvent as ReactDragEvent, KeyboardEvent as ReactKeyboardEvent, MouseEvent as ReactMouseEvent } from "react";
 import { Archive, ArrowDown, Pencil, Plus, Folder, FolderPlus, Search, BriefcaseBusiness, Copy, FolderOpen, XCircle, History, Check, ListCollapse, ListRestart, MessageSquare, Clock, Pin, MoreHorizontal, Minimize2, Maximize2 } from "lucide-react";
 import { asArray } from "../lib/array";
+import { useToast } from "../lib/toast";
 import { app } from "../lib/bridge";
 import type { ProjectNode, ProjectTopicStatus } from "../lib/types";
 import { topicActivityTime } from "../lib/session";
@@ -443,6 +444,7 @@ export function ProjectTree({
   onTimeFilterChange,
 }: ProjectTreeProps) {
   const t = useT();
+  const { showToast } = useToast();
   const compactTopics = variant === "workbench";
   const [tree, setTree] = useState<ProjectNode[]>([]);
   const [expanded, setExpanded] = useState<Set<string>>(new Set());
@@ -738,8 +740,8 @@ export function ProjectTree({
       else await app.RenameTopic(topicId, title);
       await refresh();
       if (!onRenameTopic) await onTopicsChanged?.();
-    } catch {
-      /* ignore */
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
     }
   };
 
@@ -750,8 +752,8 @@ export function ProjectTree({
     try {
       await app.RenameProject(root, title);
       await refresh();
-    } catch {
-      /* ignore */
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
     }
   };
 
@@ -763,8 +765,8 @@ export function ProjectTree({
       setConfirmAction(null);
       await refresh();
       await onTopicsChanged?.();
-    } catch {
-      /* ignore */
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
     }
   };
 
@@ -775,8 +777,8 @@ export function ProjectTree({
       setMenuPoint(null);
       await refresh();
       await onTopicsChanged?.();
-    } catch {
-      /* ignore */
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
     }
   };
 
@@ -788,8 +790,8 @@ export function ProjectTree({
       setMenuPoint(null);
       await refresh();
       await onTopicsChanged?.();
-    } catch {
-      /* ignore */
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
     }
   };
 
@@ -810,8 +812,8 @@ export function ProjectTree({
       setMenuPoint(null);
       setConfirmRemoveProject(null);
       await refresh();
-    } catch {
-      /* ignore */
+    } catch (err) {
+      showToast(err instanceof Error ? err.message : String(err), "error");
     }
   };