test: fix v3 branding drift, add reconcile CLI + registry coverage

GUI/lang-pack tests were asserting against pre-v3 strings ("Data
Cleaning Mastery", "Maestría en limpieza…") that the brand refresh
replaced with "UNALOGIX DataTools" + "Clean. Normalize. Transform."
Updated assertions to the current copy and switched the findings
panel tests to the redesigned flat-list layout (per-finding "Open
Tool →" buttons instead of per-tool expanders).

New coverage:
- tests/test_cli_reconcile.py (13) — preview/apply, tolerance flags,
  sign inversion, key flags, error paths, Excel input.
- tests/test_tools_registry.py (27) — unique tool_ids, page_slug →
  real file, valid sections/tiers, localized accessor fallbacks,
  explicit pins for PDF Extractor + Reconciler entries.
- tests/test_reconcile.py — one-side-empty, key-pass tagging,
  additional validation cases, input-DataFrame immutability.
- tests/gui/test_smoke.py — PAGE_SLUGS now includes 10_PDF_Extractor
  and 11_Reconciler in both en/es.
- tests/gui/test_workflows.py — TestPdfExtractorWorkflow and
  TestReconcilerWorkflow render checks.

Net: 2317 passed → 2418 passed, 0 failures.

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

tests/test_lang_packs.py

@@ -39,10 +39,16 @@ def _load_pack(code: str) -> dict:
 
 class TestLookup:
     def test_returns_english_value_by_default(self):
-        assert t("home.title", "en").startswith("🧹 DataTools")
+        # Hero title is "UNALOGIX DataTools" since the v3 rebrand. The
+        # Spanish value is identical (proper noun); the localized
+        # tagline lives under ``home.caption`` instead.
+        assert t("home.title", "en") == "UNALOGIX DataTools"
 
     def test_returns_spanish_value(self):
-        assert "Maestría" in t("home.title", "es")
+        # Title stays "UNALOGIX DataTools" in es too; the localized
+        # tagline is what differs.
+        assert t("home.title", "es") == "UNALOGIX DataTools"
+        assert "Limpia" in t("home.caption", "es")
 
     def test_missing_key_falls_back_to_english(self):
         # ``tools.99_pipeline_runner.name`` doesn't exist; the pipeline