fix(web): avoid false draft attachment persistence warnings

[shivamhwp]

Summary

• flush pending composer draft writes before verifying persisted image attachments
• prevent draft attachments from being marked as unsaved during the debounce window
• add a regression test covering attachment verification after the debounced write is flushed

Fixes #979

Before

After

Why

The composer draft store debounces localStorage writes, but attachment verification was reading storage immediately in a microtask. That could race the pending write and incorrectly flag persisted attachments as non-persisted, which surfaced the "Draft attachment could not be saved locally" warning even when persistence would have succeeded.

Test plan

• bun fmt
• bun lint
• bun typecheck

UI evidence

• This is a small UI behavior fix with no visual layout change.
• The warning now only appears for real persistence failures instead of debounce timing.

Made with Cursor

Note

[!NOTE]

Fix false draft attachment persistence warnings in composer draft store

• Extracts a verifyPersistedAttachments helper in composerDraftStore.ts that flushes pending debounced storage writes before reading persisted attachment IDs, preventing race conditions where attachments appeared unpersisted.
• Storage read errors are now caught and treated as an empty persisted ID set instead of throwing.
• Adds a test in composerDraftStore.test.ts that verifies nonPersistedImageIds is empty after the debounced write is flushed.

^{Macroscope summarized fdc52aa.}

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