feat v1.42.1: room-card font sizes — 3 sliders with a live preview

- space.settings.card_font_scale (tier 2 base) + room.settings
  name_scale/label_scale (tier 3), 50-300%, multiplied together and
  stacking with resize-k and kiosk per-screen multipliers
- live sample card in both the space and room dialogs
- backend schema; smoke_font_scales.mjs (9 checks); docs same-commit

docs/CHANGELOG.md

@@ -1,5 +1,14 @@
 # Changelog
 
+## v1.42.1 — 2026-07-26 (room-card font sizes)
+- Closing the "can't change the font size" feedback: **three sliders**.
+  Space settings gained a base room-card font size for the whole space;
+  Room settings gained independent sizes for the room NAME and the METRICS
+  line (50–300% each). Effects multiply — and stack with the card's corner
+  resize and the kiosk per-screen multiplier as before.
+- Both dialogs show a **live sample card** that follows the sliders as you
+  drag them.
+
 ## v1.42.0 — 2026-07-26 (room settings — the third tier)
 - **Settings now have four tiers**: global → space → room → device; the more
   specific tier overrides the more general one (owner's principle, fixed in

docs/TESTING.md

@@ -140,6 +140,11 @@ Run the *core flows* (marked ★ below) in each environment at least once per mi
       (explicit ripple color still wins); off/white lights unchanged [auto]
 - [ ] Alarm pulse (v1.27.0): leak/smoke/gas/CO/siren in 'on' pulse a red ring over any
       display mode; clears on 'off'; unavailable never alarms [auto]; reduced-motion static
+- [ ] Card font scales (v1.42.1): three sliders — space-level base (space
+      dialog) plus per-room name and metrics sizes (room settings), 50–300%,
+      multiplied together and on top of resize-k and kiosk multipliers; the
+      live sample card in both dialogs follows the sliders instantly; name and
+      metrics scale independently [auto]
 - [ ] Room settings, tier 3 (v1.42.0): a gear on every room card in the Plan
       editor opens Room settings (name, HA area incl. the current one, fill
       override, temp/hum source); the creation dialog has the same section;