supabase / supabase / 28544121548

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refactor(studio): extract useSnippetEditor from MonacoEditor (#47500)

## What

PR 7 of the SQL editor state re-layering stack. Extracts the snippet
editing lifecycle out of `MonacoEditor` into a co-located
`useSnippetEditor` hook, and consolidates the edit debounce.

`useSnippetEditor` owns:
- creating the snippet in the store on first edit and routing to its URL
(replace vs push for a `?content=` deep link)
- writing changes back to the store via `setSql` (with
`wasNeverPersisted` → `shouldInvalidate`)
- seeding the editor from the `content` param
- the read-only determination (`canEditSnippet`)

`MonacoEditor` now consumes `{ snippet, disableEdit, handleEditorChange
}` and keeps only the editor shell + Monaco action wiring. It sheds the
`router`/`profile`/`project`/`params`/store/tabs hooks.

`handleEditorChange` was also flattened with an early return.

## Debounce consolidation

Previously there were **two 1s debounces in series**: `useSnippetEditor`
debounced editor changes before writing to the store, and the save
mechanism (`createSaveMechanism`) already debounces persistence. That
added latency (up to ~2s to save) and split the "when to persist" timing
policy across two layers — at odds with PR 5's design where the
scheduler/mechanism owns *when* and dirty state is meant to be
immediate.

This PR removes the editor-side debounce: edits write to the store
synchronously on every change, and the save mechanism's 1s debounce is
the sole throttle. Net effects:
- the store — and the snippet's dirty status — reflects the latest edit
immediately (correct for the future manual-save mode's Save button / nav
guard)
- save fires ~1s after the *last* keystroke instead of up to ~2s
- only the active snippet's own reactive consumers (a lightweight
sidebar item) re-render per keystroke; Monaco is uncontrolled
(`defaultValue`) so it is unaffected

Note: the double-debounce was legacy (the pre-refactor god store had the
same `useDebounce(value, 1000)` in Monac... (continued)

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