Add controller icon PNGs and tinting logic

Commonwealth-Online/Commonwealth-Online-Public

Add per-platform controller PNGs and runtime tinting, hook them into prompts, and update deploy/stage scripts.

- Add many controller PNG assets under ui/Icons and copy them into browser/assets/icons on deploy/stage.
- New controller-glyphs.js: image-based glyph renderer that tints white pixels to the UI color via a canvas pixel pass, caches results, and supports platform selection.
- New controller-icons.js: adapter that forwards rendering to controller-glyphs.
- Update controller-prompts.js to render icon glyphs (and include LB/RB tab-switch prompts) and call hydrate after rendering.
- Call CO_ControllerGlyphs.onThemeApplied from theme.js so glyphs re-tint when theme changes.
- Include new scripts in index.html and add CSS rules for glyph image sizing in styles.css.
- Update docs/dev-log.md describing the change and testing/next steps.

This change replaces previous inline/SVG glyph handling with individual PNG icons and adds deploy-time copying so the repo keeps a single source for controller icons.

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