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/i18n/packs/en.json

@@ -168,11 +168,13 @@
   },
   "nav": {
     "section_review": "Data Review",
+    "section_analysis": "Analysis",
     "section_cleaners": "Data Cleaners",
     "section_transformations": "Transformations",
     "section_automations": "Automations",
     "review_page_title": "Review",
     "home_page_title": "Home",
+    "file_analysis_title": "File Analysis",
     "section_account": "Account",
     "activate_title": "Activate",
     "close_title": "Close",