docs: Add comprehensive implementation plans for all todo items

Created detailed markdown plans for all items in todo.md:

1. 01-playwright-scaffolding.md - Base Playwright infrastructure
2. 02-magnitude-tests-comprehensive.md - Complete test coverage
3. 03-stream-ai-to-deepgram-tts.md - TTS latency optimization
4. 04-fix-galaxy-node-clicking.md - Galaxy navigation bugs
5. 05-dark-light-mode-theme.md - Dark/light mode with dynamic favicons
6. 06-fix-double-border-desktop.md - UI polish
7. 07-delete-backup-files.md - Code cleanup
8. 08-ai-transition-to-edit.md - Intelligent node creation flow
9. 09-umap-minimum-nodes-analysis.md - Technical analysis

Each plan includes:
- Detailed problem analysis
- Proposed solutions with code examples
- Manual Playwright MCP testing strategy
- Magnitude test specifications
- Implementation steps
- Success criteria

Ready to implement in sequence.

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

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

plans/07-delete-backup-files.md

@@ -0,0 +1,78 @@
+# Plan: Delete Backup/Old Page Files
+
+**Priority:** LOW - Code cleanup
+**Dependencies:** None
+**Affects:** Code maintenance, repository cleanliness
+
+## Overview
+
+Remove all backup and old page.tsx files that are no longer needed. These files clutter the codebase and can cause confusion.
+
+## Files to Delete
+
+Need to search for:
+- `*.backup.*` files
+- `*.old.*` files
+- `*-old.*` files
+- Files with "backup" in the name
+- Commented-out old implementations
+
+## Search Strategy
+
+```bash
+# Find all backup files
+find . -name "*.backup.*" -o -name "*.old.*" -o -name "*-old.*"
+
+# Find files with "backup" in name
+find . -iname "*backup*"
+
+# Check git status for renamed files
+git status | grep -i backup
+```
+
+## Implementation Steps
+
+1. **Search for backup files**
+   ```bash
+   find app -name "*.backup*" -o -name "*.old*"
+   find components -name "*.backup*" -o -name "*.old*"
+   find lib -name "*.backup*" -o -name "*.old*"
+   ```
+
+2. **Verify files are not imported anywhere**
+   ```bash
+   # For each found file, check if it's imported
+   grep -r "import.*from.*filename" .
+   ```
+
+3. **Delete files**
+   ```bash
+   git rm app/chat/page.tsx.backup
+   # ... repeat for each file
+   ```
+
+4. **Check for commented-out code**
+   - Review recent commits for large commented blocks
+   - Remove if no longer needed
+
+5. **Commit deletion**
+   ```bash
+   git commit -m "chore: Remove backup and old files"
+   git push origin development
+   ```
+
+## Success Criteria
+
+- ✅ No `.backup` files in codebase
+- ✅ No `.old` files in codebase
+- ✅ No files with "backup" in name
+- ✅ Code still builds successfully
+- ✅ All tests still pass
+
+## Files to Delete
+
+(Will be determined during search step)
+
+Example:
+1. `app/chat/page.tsx.backup`
+2. Any other discovered backup files