feat(web): add custom bot avatar colors

[leoisadev1]

Bot avatar colors were limited to the preset palette, and dark custom colors could leave the face unreadable.

This adds a reusable custom color picker alongside the existing presets in bot creation, avatar editing, and desktop onboarding. Custom colors persist as validated six-digit hex values, and the shared avatar renderer now chooses white or near-black eyes from the body color's relative luminance for stronger contrast.

Verification:

• pnpm exec vp test run apps/web/src/components/roster/BotAvatarView.test.tsx apps/web/src/components/roster/avatarColorPicker.logic.test.ts apps/web/src/components/roster/roster.logic.test.ts apps/web/src/components/onboarding/desktopOnboarding.logic.test.ts
• pnpm --filter @t3tools/web typecheck
• Targeted vp lint for all changed files
• Interactive web verification at 1280×800: presets, custom hex entry, keyboard hue control, dark/light eye contrast, and compact viewport layout

Implemented with GPT-5.6 Sol in the Codex harness through T3 Code.

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated
akeru-bot-landing	Skipped		Sep 13, 2026 8:59pm UTC

[greptile-apps]

Greptile Summary

This change adds reusable custom avatar color selection across bot creation, avatar editing, and desktop onboarding. The picker accepts validated six-digit hexadecimal colors, supports pointer and keyboard adjustment of saturation, brightness, and hue, and selects avatar eye contrast from the body color.

Confidence Score: 5/5

Safe to merge.

The previous accessibility thread was resolved by leoisadev1 without an explanatory reply; because greptile-apps differs from the resolver, it was manually resolved without explanation. The current picker exposes saturation and brightness with the selected hex value, fully addressing the reported screen-reader behavior.

_{Reviews (2): Last reviewed commit: "fix(web): announce avatar color dimensio..." | Re-trigger Greptile}