[Due for payment 2026-07-29] [M4] Cleanup Icon legacy size boolean props

[mountiny]

Problem

M1 added a size prop backed by CONST.ICON_SIZE and a resolveIconSize adapter for backward compatibility, but the deprecated extraSmall/small/medium/large boolean props remain on Icon. Reviewers flagged this as temporary — the adapter is "wonky" and should be ripped out once call sites migrate.

Solution

After M2 and M3 complete:

• Remove deprecated boolean size props from Icon public API
• Remove resolveIconSize adapter
• Ensure all call sites use size={CONST.ICON_SIZE.*}
• Slim Icon/index.tsx facade; BaseIcon becomes the canonical Icon per team agreement

Acceptance criteria

• No remaining extraSmall/small/medium/large props on Icon
• resolveIconSize deleted
• ESLint/TypeScript clean on all migrated call sites

Origin

• [HOLD] ReportActionAvatars — Layer 1 primitives + IconsAvatar #94682 (comment)
• [No QA] Decompose Icon component #95048 (comment)

Dependencies

Blocked by:

• [Due for payment 2026-07-23] [M2] Migrate MultiGestureIcon usages #95158 — [M2] Migrate MultiGestureIcon usages
• [M3] Migrate InlineIcon usages #95159 — [M3] Migrate InlineIcon usages

Issue Owner

Current Issue Owner: @jmusial