Repair the pre-commit quality gate and clear the ruff backlog

The pre-commit hooks declared `language: system` with bare `ruff`/`ty`
entries, but both are uv-managed dev dependencies and are not on PATH, so every
commit failed with `Executable 'ruff' not found`. Route both through
`uv run`; keep ruff blocking and make ty advisory (verbose) until its 18
whole-project diagnostics are cleared.

With the gate working, clear `ruff check .` to zero:

- 18 auto-fixes (import sorting, blank lines, `max()` simplification,
  `with` merging, unused imports).
- Real defects: `SourceNavigation` annotated but never imported in
  sources_page; two naive `datetime.now()` calls in migration.py now use
  `datetime.now(UTC)`.
- Dead parameters removed: `source_has_photo_table` (computed, passed, never
  read), `_serialize_value(key=...)`, and unused `request` on two NiceGUI
  page handlers where the framework injects it optionally.
- Mechanical line-length wrapping and one `startswith` tuple collapse.
- `# noqa: PLR0915` / `# noqa: PLR1702` on five long UI/migration
  functions, following the convention already used in jobs_page and
  settings_page, rather than refactoring during stabilization.

Full suite green (377 tests, `-m "not external"`).

Co-authored-by: Copilot App <[email protected]>

tests/ui/test_documents_page.py

@@ -1,7 +1,7 @@
 """Tests for the documents page routes and action handlers."""
 
-from datetime import date
 import re
+from datetime import date
 
 import pytest
 import pytest_asyncio
@@ -10,13 +10,13 @@ from sqlmodel import select
 from transcription.db import session_scope
 from transcription.db.models import Document
 from transcription.db.models import DocumentPerson
+from transcription.db.models import DocumentTag
 from transcription.db.models import DocumentType
 from transcription.db.models import Job
 from transcription.db.models import Person
 from transcription.db.models import PersonRole
-from transcription.db.models import Tag
-from transcription.db.models import DocumentTag
 from transcription.db.models import Source
+from transcription.db.models import Tag
 from transcription.ui.pages.documents_page import _resolve_selected_tag_labels
 
 # --- Helper Fixtures ---