Two related fixes that together eliminate the 'Loading your TikTok
account settings…' flicker users were seeing on every keystroke /
variant click in the post editor:
1. PostController::edit no longer wraps tiktokCreatorInfos in
Inertia::defer. The map is computed during the initial render and
shipped as a regular prop. Without defer, the prop never resets to
null between Inertia visits, so the loading line never reappears.
2. TikTokCreatorInfo::fetch is now wrapped in a 5-minute Cache::remember
keyed by social_account_id. Autosaves (which round-trip through
PostController::update → back() → edit() again) used to issue a
fresh TikTok API call for every connected account on every save —
now the cache short-circuits them. Creator info changes very rarely
(only when the user updates privacy settings on TikTok itself), so
five minutes of staleness is acceptable; the worst case is a
slightly out-of-date privacy-options list that corrects on next
page load.
Frontend cleanup: dropped the creatorInfoLoading prop, the inline
loading <p>, and the now-orphaned posts.form.tiktok.creator_info_loading
i18n key in en/pt-BR/es. ScheduleTab no longer passes the prop.
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