Add guest mode functionality for read-only access

- Implement guest mode for unauthenticated users
- Allow file viewing and downloading without login
- Hide create/edit/delete functions for guests
- Add guest mode banner with login prompt
- Add read-only badges for guest accessible files
- Include permission checks for all CRUD operations
- Add responsive guest mode styling
- Support both online (Supabase) and offline (localStorage) modes

Features:
• Guest users can view all files and download attachments
• Authentication required for create, edit, delete operations
• Seamless transition between guest and authenticated modes
• User-friendly guest experience with clear login prompts

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.claude/settings.local.json

@@ -0,0 +1,16 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git push:*)",
+      "Bash(git remote remove:*)",
+      "Bash(git remote add:*)",
+      "Bash(git remote set-url:*)",
+      "WebFetch(domain:ngrok.com)",
+      "Bash(python:*)",
+      "WebFetch(domain:developers.cloudflare.com)",
+      "Bash(git add:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}