feat(fs-watcher): add inotify watch limit sensing with toast warning

v2/src/lib/adapters/fs-watcher-bridge.ts

@@ -26,3 +26,16 @@ export function onFsWriteDetected(
 ): Promise<UnlistenFn> {
   return listen<FsWriteEvent>('fs-write-detected', (e) => callback(e.payload));
 }
+
+export interface FsWatcherStatus {
+  max_watches: number;
+  estimated_watches: number;
+  usage_ratio: number;
+  active_projects: number;
+  warning: string | null;
+}
+
+/** Get inotify watcher status including kernel limit check */
+export function fsWatcherStatus(): Promise<FsWatcherStatus> {
+  return invoke('fs_watcher_status');
+}

v2/src/lib/components/Workspace/ProjectBox.svelte

@@ -13,7 +13,7 @@
   import MemoriesTab from './MemoriesTab.svelte';
   import { getTerminalTabs } from '../../stores/workspace.svelte';
   import { getProjectHealth } from '../../stores/health.svelte';
-  import { fsWatchProject, fsUnwatchProject, onFsWriteDetected } from '../../adapters/fs-watcher-bridge';
+  import { fsWatchProject, fsUnwatchProject, onFsWriteDetected, fsWatcherStatus } from '../../adapters/fs-watcher-bridge';
   import { recordExternalWrite } from '../../stores/conflicts.svelte';
   import { notify } from '../../stores/notifications.svelte';
 
@@ -58,10 +58,17 @@
     const projectId = project.id;
     if (!cwd) return;
 
-    // Start watching
-    fsWatchProject(projectId, cwd).catch(e =>
-      console.warn(`Failed to start fs watcher for ${projectId}:`, e)
-    );
+    // Start watching, then check inotify capacity
+    fsWatchProject(projectId, cwd)
+      .then(() => fsWatcherStatus())
+      .then((status) => {
+        if (status.warning) {
+          notify('warning', status.warning);
+        }
+      })
+      .catch(e =>
+        console.warn(`Failed to start fs watcher for ${projectId}:`, e)
+      );
 
     // Listen for fs write events (filter to this project)
     let unlisten: (() => void) | null = null;