feat: dot + ripple identity mark

[brianorwhatever]

Summary

• Replace the plain violet dot with the "01 · Original" mark from the identity pack: violet dot + soft ripple ring (opacity 0.25), proportions locked to dot r = 0.218·s, ring r = 0.373·s, stroke = max(1.5, 0.0136·s).
• .boop-dot gains an em-scaled ::after ring so every wordmark site — App header, Settings, PublicList, Login, Compare, SharedListResource — updates automatically.
• Landing page wordmark (.wordmark .dot, sm variant) and hero .mark get matching rings sized for their pixel/clamp contexts.
• Favicon SVG in index.html moves to the 220 viewBox used by the design file and renders dot + ring.
• scripts/generate-icons.mjs rewritten to produce the design's "iOS rounded" artboard (violet tile, cream mark with cream ring at 0.4 opacity) and cream/ink splashes with the dot + ring. Ran generate:assets to push the new source through the full iOS + Android size matrix.

Test plan

• Spot-check the header wordmark in the running app at light/dark and common font sizes (App header 20px, Login 26px, footer 14px).
• Visit / (Landing) and confirm the nav wordmark and the hero mark both render the ripple.
• Open a new browser tab and confirm the favicon shows the dot + subtle ring.
• Install the iOS build and check the home-screen icon + cold-launch splash match the new mark.
• Install the Android build and confirm ic_launcher (square + round + adaptive foreground) + splash match.

🤖 Generated with Claude Code