supabase / supabase / 29018749305

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feat(sql-editor): add manual save feature preview (#47745)

## What

Adds an opt-in **SQL Editor manual save** feature preview that switches
the SQL Editor from autosaving every edit to saving only on demand, and
hardens the tab-close flow so unsaved edits are handled correctly.

## Changes

**Feature preview**
- New `sqlEditorManualSave` flag + `UI_PREVIEW_SQL_EDITOR_MANUAL_SAVE`
local-storage toggle, wired into the Feature Preview modal with an
explanatory panel.
- `useIsSqlEditorManualSaveEnabled` gates behavior on both the flag and
the user's preview opt-in.

**Editor toolbar**
- Save button (with `Cmd+S`) next to Run, plus an autosave status
indicator showing dirty/saving/saved state and a shortcut to disable
autosave (emits a `sql_editor_autosave_disable_clicked` telemetry
event).

**Discard on close**
- Closing a snippet tab with unsaved edits prompts for confirmation and,
on confirm, actually discards the local edits and evicts the cached
server copy so the snippet reopens clean.

**Decouple tab layout from SQL specifics**
- Tabs store gains a generic per-type close-handler registry
(`registerTabCloseHandler` / `getCloseConfirmation` / `closeTabs`). The
SQL editor registers its discard + confirmation behavior from the save
coordinator.
- Low-level `removeTab`/`removeTabs` (rename/move re-keying, stale
cleanup) intentionally do **not** trigger discard.
- Adds `statusOnDiscard` lifecycle transition and `clearSnippetContent`
store action.

## Testing
- `pnpm --filter=studio typecheck` — clean.
- Added unit tests for the close-handler registry (fires on single/multi
close, skips re-keying/cleanup removals, respects tab type, selects
confirmation copy, unregisters cleanly).

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added a SQL editor manual-save preview with a “Save” button and
`Cmd+S`, plus a modal option to disable manual-save/preview.
* Added “unsaved changes” tab s... (continued)

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