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>

.pre-commit-config.yaml

@@ -0,0 +1,21 @@
+# Pre-commit configuration for Clide
+# See https://pre-commit.com for more information
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-toml
+      - id: check-added-large-files
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.3.0
+    hooks:
+      # Run the linter
+      - id: ruff
+        args: [--fix]
+      # Run the formatter
+      - id: ruff-format