watch plugin: analog clock overlay with SVG watchface

Simple watchface with second-hand wobble animation, 5-min idle
auto-show, W key toggle, light/dark theme colors, backdrop blur
from theme settings. Grace period prevents instant dismiss.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/plugins/watch/faces/simple/second.svg

@@ -0,0 +1,25 @@
+<svg
+   width="176.00125mm"
+   height="176.00124mm"
+   viewBox="0 0 176.00125 176.00124"
+   version="1.1"
+   id="svg1"
+   xml:space="preserve"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs1" /><g
+     id="layer1"
+     transform="translate(-16.173035,-17.825715)"><rect
+       style="display:inline;fill:var(--watch-svg-second-fill, var(--watch-second-color, #fff));fill-opacity:1;stroke:none;stroke-width:0.144369;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1;paint-order:fill markers stroke"
+       id="rect237"
+       width="3.69275"
+       height="10.303658"
+       x="-106.02003"
+       y="24.220301"
+       ry="1.846375"
+       transform="scale(-1,1)" /><circle
+       style="display:none;fill:none;fill-opacity:0.38222;stroke-width:0.0278984;stroke-linejoin:round;paint-order:fill markers stroke"
+       id="circle256"
+       cx="104.17366"
+       cy="105.82634"
+       r="88.000626" /></g></svg>