feat(brand): rebrand to UNALOGIX DataTools + Clean. Normalize. Transform.

User-facing copy + brand updates landed together:

- Page H1 + browser-tab title: "DataTools — Data Cleaning Mastery"
  → "UNALOGIX DataTools". Same change in es.json (was "DataTools —
  Maestría en limpieza de datos").
- Hero subtitle: long descriptive caption replaced with the tagline
  "Clean. Normalize. Transform." (es: "Limpia. Normaliza.
  Transforma.").
- Sidebar brand block: wordmark is now two lines — UNALOGIX in tiny
  uppercase tracked eyebrow style on top, DataTools in the 15px
  semibold wordmark beneath. The 28px "D" chip stays as the
  recognizable mark. New ``.dt-brand-eyebrow`` rule in
  ``_DESIGN_TOKENS_CSS``.

Top-right Streamlit chrome cleanup — the user reported two stacked
icon buttons. ``.streamlit/config.toml`` bumped to
``toolbarMode = "viewer"`` (most aggressive — suppresses status
indicator + deploy button + running glyph). CSS belt-and-suspenders
hides ``stToolbar``, ``stToolbarActions``, ``stStatusWidget``,
``stDecoration`` for newer Streamlit releases that keep emitting
these with inline styles even under toolbarMode=viewer.

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

src/i18n/packs/en.json

@@ -4,9 +4,9 @@
     "footer": "Runs locally. Your data never leaves this computer. | DataTools v3.0"
   },
   "home": {
-    "page_title": "DataTools — Data Cleaning Mastery",
-    "title": "DataTools — Data Cleaning Mastery",
-    "caption": "A 9-tool suite for cleaning, standardizing, and validating tabular data.",
+    "page_title": "UNALOGIX DataTools",
+    "title": "UNALOGIX DataTools",
+    "caption": "Clean. Normalize. Transform.",
     "privacy_pill": "Runs 100% locally",
     "findings_badge_one": "{n} finding",
     "findings_badge_other": "{n} findings"