Add TODO.md integration to TODOs panel

- Parse TODO.md markdown checkboxes and display in collapsible section
- Add ProjectTodoItem model for TODO.md items with section/subsection support
- Swap context panel tab order to: Jira, TODOs, Problems
- Add "Create TODO.md" button when file doesn't exist with template
- Click project TODO items to navigate to TODO.md at that line
- Add header to TODO.md explaining Clide integration format
- Add pre-commit config with ruff linting and formatting
- Update ruff ignore rules for Textual patterns

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -111,6 +111,11 @@ select = [
 ]
 ignore = [
     "E501",   # line too long (handled by formatter)
+    "ARG002", # unused method argument (Textual event handlers require these)
+    "SIM102", # nested if (sometimes clearer)
+    "SIM105", # contextlib.suppress (try-except-pass is clearer in context)
+    "SIM115", # context handler for files (sometimes not applicable)
+    "PTH123", # Path.open() vs open() (not always cleaner)
 ]
 
 [tool.ruff.lint.isort]