1.2.12: eyedropper — sample colours from anywhere on the page

Tiny progressive-enhancement feature using the browser's native
EyeDropper API (Chromium 95+). Adds a small pipette button next
to every colour swatch in the properties panel; clicking it opens
the OS picker and applies the chosen sRGBHex to the bound colour
property.

- src/composables/useEyeDropper.ts: returns { supported, pick }.
  `supported` re-detects on every call (not a singleton) so a late-
  loaded polyfill or a test-time monkey-patch is observed without
  juggling Vite's module cache. `pick()` resolves to the chosen
  hex string, returns null on cancel / abort / missing API.
- PropertiesPanel: PhEyedropper button on each of the three colour
  rows (fill, stroke, shadow). v-if="eyeDropperSupported" hides
  the button entirely on Safari + Firefox — clean PE. Fill and
  stroke buttons disable when their "Transparent" toggle is on.
  Picked colour writes through the same fillColor / strokeColor /
  shadowColorValue computeds, so the keyframe path / asset writer
  is identical to a color-input drag.
- properties.eyedropper i18n string.

Tests (7 new under "eyedropper — color sampling from anywhere on the page"):
- supported reflects window.EyeDropper presence at call time.
- pick() resolves with the sRGBHex from a stubbed EyeDropper.
- pick() returns null on AbortError.
- pick() returns null when the API is missing.
- PropertiesPanel renders eyedropper buttons when supported.
- PropertiesPanel hides them when EyeDropper is undefined.
- Clicking the fill eyedropper applies the picked colour through
  the layer's keyframe / asset writer.

`claude.txt` backlog complete (wiggle / motion-paths / eyedropper
all shipped).

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "ruwio",
   "private": true,
-  "version": "1.2.11",
+  "version": "1.2.12",
   "type": "module",
   "scripts": {
     "dev": "vite",