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fix(auth): retry IndexedDB availability check on startup failure (#9845)

* fix(auth): retry IndexedDB availability check on startup failure

In environments like Chrome Extension Manifest V3 Service Workers, the initial IndexedDB transaction upon a cold start can sometimes drop or timeout. Previously, `_isAvailable()` would immediately catch the error, assume IndexedDB is broken, and silently fall back to `inMemoryPersistence`.

This updates `_isAvailable()` to use the `_withRetries()` helper, ensuring it benefits from the same retry logic as actual storage operations. This prevents the SDK from incorrectly abandoning existing IndexedDB auth state.

Fixes #9732

* style(auth): run yarn format

* chore: add changeset for IndexedDB availability check retry

* fix(auth): robust IndexedDB connection handling and test stability

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