Button migration batch 10: leftover files after census re-scan + BaseWidgetItem public API

[MelvinBot]

Sub-issue of #83762.
Tracks PR #98861.

Batch

• Shape: leftover files (extra, 10th batch)
• Area: all
• Scope: 44 leftover files that appeared after the original 282-file census, plus BaseWidgetItem's buttonProps public API and its 14 callers.
• Note: Adds accessibilityLabel support to ButtonIcon to preserve NumberWithSymbolForm's icon labels.

Files

Full list in the PR diff (#98861). Highlights:

• src/components/ButtonComposed/primitives/ButtonIcon.tsx — add accessibilityLabel support
• src/components/BaseWidgetItem.tsx — migrate buttonProps public API (+ its 14 callers)
• 44 leftover @components/Button consumers across src/components/** and src/pages/** (ForYouSection, TimeSensitiveSection/items/*, workspace/settings/signin pages, various modals and footers)

Migration rules

Mechanical swap per prop-change rules:

• Import: @components/Button → @components/ButtonComposed
• text / icon / related props → <Button.Text> / <Button.Icon> children
• success / danger → variant="success" / variant="danger"
• small / medium / large → size={CONST.BUTTON_SIZE.SMALL | MEDIUM | LARGE}
• Keep each wrapper's public API as-is; map to composed Button internally only

Acceptance criteria

• Every migrated file has no remaining @components/Button import
• BaseWidgetItem buttonProps public API and all 14 callers migrated
• ButtonIcon accessibilityLabel preserves NumberWithSymbolForm icon labels
• eslint-seatbelt count reduced accordingly
• PR author spot-checks representative migrated screens (label, variant, size, icon side, disabled/loading, press, ref)

Dependencies

• Blocked by batch 1: deprecation guard must exist before merge