supabase / supabase / 26122568821

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fix(studio): preserve unsaved columns in table editor across refetches (#46073)

## Summary
- Fixes FE-3386: columns added via the Table Editor side panel vanished
when components auto-refreshed.
- Root cause: a `useEffect` re-initialized `tableFields` from server
data on every `table` / `foreignKeyMeta` refetch, clobbering unsaved
local edits.
- Fix (initial): `hasInitializedRef` gates the late-init path so it runs
at most once per panel session (to incorporate late-arriving
`foreignKeyMeta`) and resets on panel close.
- Fix (follow-up): handle the race where the user starts editing
*before* `foreignKeyMeta` resolves. Added `hasUserEditsRef` (flipped on
user edits, reset on panel close) and a `mergeForeignKeyMeta` utility.
Both late-init paths now merge FK metadata into existing `tableFields`
instead of wholesale-replacing when the user has unsaved edits —
`foreignKey` is only injected onto matching server-originated columns,
so user-added columns and other in-progress edits survive.

Linear: FE-3386

## Test plan
- [ ] Open the Table Editor on an existing table.
- [ ] Add one or more new columns via the side panel.
- [ ] Watch the foreign key section flash / resolve its loading state.
- [ ] Confirm the newly-added columns are NOT removed when the FK
section resolves.

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