Restore Vue auto-import completions with the Astro extension

[matthewp]

Changes

• Astro's Volar proxy caches getCompletionsAtPosition the first time it is accessed. Vue later replaces that method, but the stale wrapper prevents Vue's auto-import logic from running.
• Invalidates the cached method on assignment so the next request rebuilds the wrapper around Vue's decorated method, restoring auto-imports when Astro loads first. Fixes Vue + Astro extension conflict: no auto-import suggestions in Vue template prop expressions #15962.

Testing

• Adds a regression test proving methods assigned by a later TypeScript plugin replace cached wrappers.

Docs

• No docs update needed; this restores existing editor behavior.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9350007

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
astro-vscode	Patch

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[matthewp]

Volar gets built into the extension so it's fine to patch.

[delucis]

Changes seem sound to me!