[Due for payment 2026-08-08] [M2] Unify avatar sizes

[mountiny]

Problem

CONST.AVATAR_SIZE has confusing, overlapping names (LARGE_NORMAL < MEDIUM, LARGE_BORDERED = 80px + border baked in, one-off sizes used once). This makes avatar sizing hard to reason about and blocks clean primitive APIs.

Solution

Rename/consolidate CONST.AVATAR_SIZE to a consistent ordinal scale. Remove rarely-used sizes by mapping call sites to nearest existing size. Separate border width from size enum (e.g. LARGE_BORDERED → X_LARGE size + border via StyleUtils, not size + 8px).

PR

#95275

Origin

#94682 (comment)

Dependencies

Independent of M1/M3/M4 but touches many of the same files — coordinate merge/rebase with M1.

Issue Owner

Current Issue Owner: @ChavdaSachin

[roryabraham]

PR reviews in progress

[mitarachim]

Deploy Blocker #97564 was identified to be related to the PR #95275 that attempted to fix this issue.

[melvin-bot]

⚠️ Looks like this issue was linked to a Deploy Blocker here

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