refactor(gui): drop Review page + normalization gate

Home is now the only entry point: the "Run analysis" button on the
upload section IS the review step (findings render inline via
render_findings_panel). Tool pages no longer gate on a passed
normalization — running the analyzer is sufficient context.

Removed:
- src/gui/pages/0_Review.py
- src/gui/components/gate.py (re-export seam)
- require_normalization_gate() in src/gui/components/_legacy.py
- "review" section enum in tools_registry.py
- Data Review entry in app.py navigation
- require_normalization_gate() calls + imports in all nine tool pages
- tests/gui/test_gate.py (whole file)
- TestReviewWorkflow in tests/gui/test_workflows.py
- 0_Review entry in tests/gui/test_smoke.py PAGE_SLUGS
- stash_upload's normalization_result+normalization_for stashing
- stash_upload_without_gate (was the gate's negative-path helper)

2017 tests pass (16 retired with the gate flow).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/gui/test_smoke.py

@@ -25,7 +25,6 @@ from .conftest import collected_text, with_language
 # Every page that ships in the sidebar nav. Slugs match the filenames
 # under ``src/gui/pages/`` so failures point at a real file.
 PAGE_SLUGS = [
-    "0_Review",
     "1_Deduplicator",
     "2_Text_Cleaner",
     "3_Format_Standardizer",
@@ -53,7 +52,6 @@ PAGE_SLUGS = [
 # When a page gains real Spanish translation, flip its 'es' entry to
 # the localized substring — the test surface stays the same.
 EXPECTED_SUBSTRINGS: dict[str, dict[str, str]] = {
-    "0_Review":              {"en": "Review",            "es": "Review"},
     "1_Deduplicator":        {"en": "Find Duplicates",   "es": "Find Duplicates"},
     "2_Text_Cleaner":        {"en": "Clean Text",        "es": "Clean Text"},
     "3_Format_Standardizer": {"en": "Standardize",       "es": "Standardize"},