…, locale, slots Closes the items left on `rewrite/release-plan.md` step 4 — the last GA gaps before tagging beta. Each behavior change ships with a Storybook regression test; each new public surface is exported and documented. - ChatFooter gains `maxFiles` and `maxFileSize` props (both default `0` = disabled), forwarded by `Chat`/`AdvancedChat`. Files past the cap are emitted as a new `invalid-file: { file, reason }` event so hosts can surface their own error UI. Closes #461, #474. - Chat gains `typingIndicatorPosition: 'header' | 'composer' | 'both' | 'none'` (default `'header'`). When the policy includes `composer`, Chat renders a typing line above ChatFooter; the new `composer-typing` scoped slot exposes the resolved string for full customization. Closes #513. - Chat gains `autoScroll: { onMount?, onChatSwitch?, onSend?, onReceive? }` policy prop. Each leg defaults `true` to match the alpha.2 hard-coded behavior; consumers can opt out per leg. - `getLocalizationStrings('auto')` now actually negotiates against `navigator.language` via the new exported `negotiateLocale()` helper. Resolves to `'en'` for English locales (no behavior change). For unsupported locales, still resolves to `'en'` but warns under DEV so the gap is visible. SSR-safe (returns `'en'` when `navigator` is undefined). - Slot inventory documented inline (``) on every public slot in Chat / Chats / ChatHeader / ChatFooter / Message. Storybook autodocs picks them up; README adds a single-page slot reference table. - ChatHeader gains internal `showTypingIndicator` prop so Chat can suppress the header's typing line when the policy renders it somewhere else. - Refresh `rewrite/issue-triage.md` against alpha.2-5 (move shipped items from "Bundle" buckets into a new "Bundle into 3.0 — landed" table with version columns; add post-2024 architecture-resolved noise to the resolved bucket; add #573 / #546 / #531 as the remaining bundle-into-beta candidates). - Refresh `rewrite/release-plan.md` step 4 to reflect what shipped in alpha.2 vs what landed now in alpha.5; bring the versioning ladder up to date. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Uh oh!

Horrible Link Contrast #546

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