feat(nav): group Home + Reconcile under a new "Analysis" section

Home now appears in the sidebar as "File Analysis" under a labeled
"Analysis" section together with Reconcile Two Files — both pages
are data-analysis workflows (importing/profiling files vs. matching
across files), so grouping them clarifies the sidebar's mental model.

- tools_registry: new ``analysis`` Section; reconcile moves out of
  automations into it.
- i18n: ``nav.section_analysis`` + ``nav.file_analysis_title`` added
  to en.json and es.json.
- app.py: home dropped from the unlabeled section and surfaced at the
  top of the Analysis group; ``default=True`` preserved so first-visit
  routing is unchanged.

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

src/gui/tools_registry.py

@@ -24,7 +24,7 @@ Tier = Literal["core", "pro", "enterprise"]
 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["cleaners", "transformations", "automations"]
+Section = Literal["analysis", "cleaners", "transformations", "automations"]
 
 
 @dataclass(frozen=True)
@@ -167,7 +167,7 @@ TOOLS: list[Tool] = [
         ),
         page_slug="11_Reconciler",
         status="Ready",
-        section="automations",
+        section="analysis",
     ),
 ]
 
@@ -175,6 +175,7 @@ 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",