refactor: Improve debug panel delete handler and add debug endpoint

- Refactored UserMenu debug panel delete handler to match ThoughtGalaxy pattern
- Added proper error handling with Mantine notifications
- Added loading state management during delete operations
- Created /api/nodes/debug endpoint for development debugging
- Cleaned up debug logging from DELETE endpoint

The debug panel now uses the same delete pattern as ThoughtGalaxy for consistency,
with proper error notifications and state updates.

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

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

todo.md

@@ -6,11 +6,15 @@ Upcoming items that should be implemented (time-permitting):
   playwright mcp testing as well as that of magnitude
 - ADD MAGNITUDE TESTS FOR EVERYTHING, both existing and new additions
 - stream the AI output to deepgram for faster synthesis
-- fix the freaking galaxy node clicking -- when going directly to a node ID
-  link, it redirects to /chat; when clicking on a node in /galaxy (either
-  general or on a specific node ID url there), it closes the modal automatically
-- dark mode/light mode favicon and overall app theme
+- dark mode/light mode favicon
 - fix the double border on desktop between sidebar and conversation actions UI
 - delete "backup"/"old" page.tsx files
 - allow ai to transition to edit in chat
-- why wait for three nodes before umap?
+- fix creation/display of node links
+- render markdown
+- fix the "new tables being created instead of adding to the proper table"
+  issues we're having with the other tables like we were having with the node
+  table and we're now having with at least the oauth session, oauth state, and
+  user tabless; it's probably happening with the link_to table as well but that
+  one doesn't have data because it seems like link creation is broken (see task
+  above to fix)