fix(desktop): address PR #173 review comments

- Surface write-through failure in persistMutation instead of silently
  swallowing the error, so callers can propagate it to the UI
- Classify workspace migration collision and missing tracked-file errors
  as IPC_BAD_INPUT in snapshots-ipc for actionable client-side messages
- Normalize workspace paths before comparison in FilesTabView to avoid
  false rebind prompts caused by trailing slashes or path-separator diffs

Signed-off-by: roy1994 <dev.mancitrus@outlook.com>

Author: MoveCloudROY

apps/desktop/src/main/index.ts

@@ -231,12 +231,14 @@ export function createRuntimeTextEditorFs({
       mkdirSync(path_module.dirname(destinationPath), { recursive: true });
       writeFileSync(destinationPath, content, 'utf8');
     } catch (err) {
+      const message = err instanceof Error ? err.message : String(err);
       logger.error('runtime.fs.writeThrough.fail', {
         designId,
         filePath,
         workspacePath: design.workspacePath,
-        message: err instanceof Error ? err.message : String(err),
+        message,
       });
+      throw new Error(`Workspace write-through failed for ${filePath}: ${message}`);
     }
   }
 

apps/desktop/src/main/snapshots-ipc.ts

@@ -410,7 +410,14 @@ export function registerWorkspaceIpc(db: Database, getWin: () => BrowserWindow |
       } catch (err) {
         if (err instanceof CodesignError) throw err;
         if (err instanceof Error && err.message.includes('already bound')) {
-          throw new CodesignError(err.message, 'IPC_CONFLICT');
+          throw new CodesignError(err.message, 'IPC_CONFLICT', { cause: err });
+        }
+        if (
+          err instanceof Error &&
+          (err.message.includes('Workspace migration collision') ||
+            err.message.includes('Tracked workspace file missing'))
+        ) {
+          throw new CodesignError(err.message, 'IPC_BAD_INPUT', { cause: err });
         }
         throw new CodesignError('Workspace update failed', 'IPC_DB_ERROR', { cause: err });
       }

apps/desktop/src/renderer/src/components/FilesTabView.tsx

@@ -50,7 +50,11 @@ function WorkspaceSection() {
       setPicking(true);
       const path = await window.codesign.snapshots.pickWorkspaceFolder();
       if (path && currentDesign && currentDesignId) {
-        if (currentDesign.workspacePath && currentDesign.workspacePath !== path) {
+        const normalizePath = (p: string) => p.replaceAll('\\', '/').replace(/\/+$/, '');
+        if (
+          currentDesign.workspacePath &&
+          normalizePath(currentDesign.workspacePath) !== normalizePath(path)
+        ) {
           requestWorkspaceRebind(currentDesign, path);
         } else if (!currentDesign.workspacePath) {
           await window.codesign.snapshots.updateWorkspace(currentDesignId, path, false);