feat(brand): V-viewfinder 3a — the approved rebrand (was: split-W)

The V-viewfinder was approved during the favicon-v2 picker at
/v2/, then deployed prematurely (e7b9756) and reverted (81effca) after
the 'design pick is not a deploy command' lesson. Deploying it now with
explicit go-ahead.

Files: yellow V outline with the Camogli harbor visible inside, navy
field outside. Replaces the split-W (two Vs forming a W) across:
- favicon-16/32/64
- apple-touch-icon (180)
- icon-192 + icon-512 manifest icons
- icon-512-maskable (V at 65% safe zone)
- favicon.svg vector
- favicon.ico multi-res
- root-level apple-touch-icon{,-precomposed}.png for iOS fallback paths

Cache-bust query bumped to ?v=20260515-vviewfinder so browsers refetch.

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

public/favicon.svg

@@ -1,12 +1,6 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
-  <defs>
-    <clipPath id="wv-left"><rect x="0" y="0" width="32" height="64"/></clipPath>
-    <clipPath id="wv-right"><rect x="32" y="0" width="32" height="64"/></clipPath>
-  </defs>
-  <rect width="64" height="64" rx="12" fill="#1a3a5c"/>
-  <g font-family="system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif"
-     font-weight="900" font-size="56" text-anchor="middle">
-    <text x="32" y="50" fill="#fafafa" clip-path="url(#wv-left)">W</text>
-    <text x="32" y="50" fill="#f0d000" clip-path="url(#wv-right)">W</text>
-  </g>
+  <rect width="64" height="64" rx="10" fill="#0e2740"/>
+  <path d="M 12 12 L 32 52 L 52 12"
+        stroke="#f0d000" stroke-width="6"
+        stroke-linejoin="round" stroke-linecap="round" fill="none"/>
 </svg>