feat(app): allow .claude folder in file browser tree

Updates vite-fs tree walker to include .claude directories so users
can browse CLAUDE.md, settings, hooks, and memory files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/vite-fs.ts

@@ -78,7 +78,7 @@ function handleTree(req: Connect.IncomingMessage, res: any) {
     if (depth > MAX_DEPTH || entryCount >= MAX_TREE_ENTRIES) return []
     try {
       const entries = readdirSync(dir, { withFileTypes: true })
-        .filter(e => !IGNORED.has(e.name) && !e.name.startsWith('.'))
+        .filter(e => !IGNORED.has(e.name) && (!e.name.startsWith('.') || e.name === '.claude'))
         .sort((a, b) => {
           // Directories first, then alphabetical
           if (a.isDirectory() !== b.isDirectory()) return a.isDirectory() ? -1 : 1