Existing frontend: detect, report, then keep or restyle (ticket 03)

- templates/detect_frontend.py: finds plain HTML, React/Vue/Angular/Svelte apps
  and PyQt web views; prints location, stack, main colours, font and every
  token block (CSS custom properties, <style> tags, Tailwind config).
- templates/frontend.md: shared report / keep / restyle procedure, written
  so rpa-dashboard-ai can point to it.
- SKILL.md steps 1, 2 and 6 point to it.
- tests: detection self-check; fixture c-web-existing-frontend; eval entries
  c-keep and c-restyle (new pages only, per-question grading, checks on what
  changed in the existing files), both passing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/evals/results/c-keep.json

@@ -0,0 +1,29 @@
+{
+  "fixture": "c-keep",
+  "passed": true,
+  "checks": {
+    "frontend reported correctly": true,
+    "asks /keep|restyle/": true,
+    "asks /section/": true,
+    "never asks /^(?!.*(keep|restyle)).*(colou?r|Tebra Sky|Ember)/": true,
+    "never asks /desktop/": true,
+    "existing files unchanged": true,
+    "exactly one page built": true,
+    "no placeholders left": true,
+    "page has --accent:#0f766e": true,
+    "page has Trebuchet MS": true,
+    "page check passes": true
+  },
+  "page_check": [
+    "22 passed in 18.02s"
+  ],
+  "files": [
+    "README.md",
+    "web\\css\\app.css",
+    "web\\css\\theme.css",
+    "web\\dashboard.html",
+    "web\\index.html",
+    "web\\js\\app.js"
+  ],
+  "reply": "Dashboard ready \u2014 **`web/dashboard.html`** (web path, plain HTML, sample data).\n\n| Item | Status |\n|---|---|\n| Look | **Kept** \u2014 the colours and fonts come from `web/css/theme.css` (teal brand, Trebuchet/Georgia), for both light and dark |\n| Existing files | **Not touched** (index.html, theme.css, app.css, app.js are unchanged) |\n| Sections | Sidebar, top bar (dark mode toggle + status dot), KPI cards, status donut, Run panel (steps + log), Report table (search + Excel). No optional sections. |\n| Data | `SAMPLE_DATA = true` \u2014 there is no bot yet. Steps are `Initializing \u2192 Load jobs \u2192 Process jobs \u2192 Completed`. Report columns are Job / Site / Status. |\n\n**Checks (headless Playwright):** 6 KPI batches, 4 legend items, 4/4 steps done, 5 log lines, 4/4 report rows with pills. No `{{` left and no console errors. I checked light, dark and 800px wide.\n\n- **Small tweak:** the Run button was the same teal as the top bar, so it was hard to see. I set `--primary-bg` to the project's own `--color-brand-strong` (#115e59).\n- **Palette fill-ins:** the project has no token for `--accent-2`, `--accent-dark` or `--accent-soft-2`, so those come from `palette.py`. All contrast checks pass.\n- **When the bot exists:** it must send the `status`, `step`, `log`, `dashboard_data` and `report_data` events. Set `SAMPLE_DATA=false` and serve `/api/dashboard` and `/api/run/status`.\n- **Navigation:** add a link to `dashboard.html` from your nav in `index.html`. I didn't edit that file.\n\nFRONTEND: web/ \u2014 plain HTML (web), tokens in web/css/theme.css (:root + [data-theme=\"dark\"]), brand #0f766e, fonts \"Trebuchet MS\"/Georgia\nQUESTIONS: Keep its look, or restyle it? | Which optional sections should I add: checkpoint tracker, admin/roles screen, login page, or none?"
+}