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>

src/gui/tools_registry.py

@@ -25,7 +25,7 @@ Status = Literal["Ready", "Coming Soon"]
 # Sidebar grouping. Tools are bucketed by what the user is trying to
 # accomplish rather than by implementation detail.
 Section = Literal[
-    "analysis", "cleaners", "transformations", "automations",
+    "cleaners", "transformations", "automations",
     "finance", "coming_soon",
 ]
 
@@ -189,7 +189,6 @@ TOOLS: list[Tool] = [
 # Display labels for each sidebar section. Kept here so i18n falls back
 # to a sensible English string if a translation pack is missing the key.
 SECTION_LABELS: dict[Section, str] = {
-    "analysis": "Analysis",
     "cleaners": "Data Cleaners",
     "transformations": "Transformations",
     "automations": "Automations",