test+fix(gui): retire the now-empty "analysis" nav section

The journey-level nav restructure moved Home to a standalone "Start
here" entry and Reconcile into the "Finance" group, leaving the
"analysis" section with zero tools. Two registry tests encoded the old
layout and failed:
- test_every_section_has_at_least_one_tool[analysis] (empty section)
- test_reconciler_present (asserted section == "analysis")

Drop "analysis" from the Section literal, SECTION_LABELS, and app.py's
by_section bucket — it's genuinely dead now (home isn't a registry Tool).
Update the presence tests to assert Reconcile + PDF to CSV live in
"finance". The section-invariant tests (every section non-empty, has a
label, no orphan labels) are preserved and pass.

Full suite: 2441 passed, 91 skipped, 0 failed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_tools_registry.py

@@ -239,12 +239,15 @@ class TestReconcilerAndPdfArePresent:
         assert tool is not None
         assert tool.page_slug == "10_PDF_Extractor"
         assert tool.status == "Ready"
+        # PDF to CSV + Reconcile live in the "Finance" group (outside the
+        # cleaning flow) per DECISIONS.md 2026-06-08.
+        assert tool.section == "finance"
 
     def test_reconciler_present(self):
         tool = tool_by_id("11_reconciler")
         assert tool is not None
         assert tool.page_slug == "11_Reconciler"
         assert tool.status == "Ready"
-        # The new "analysis" section was introduced with this tool;
-        # if the section disappears, the sidebar group goes empty.
-        assert tool.section == "analysis"
+        # Reconcile sits in the "Finance" group (see DECISIONS.md
+        # 2026-06-08); if that section disappears the sidebar goes empty.
+        assert tool.section == "finance"