v0.1.10

Replies now open in the bottom-right composer, matching reopened drafts, with editable recipients and subject.

• Fixed background mail sync closing an active reply and losing unsaved text.
• Pending draft edits are saved when navigating away, including while an earlier save is still running.
• Preserved reply threading, signatures, attachments, and AI conversation context.

Validated with 141 unit tests and desktop regression tests for both unified and account inboxes.

Full changelog: v0.1.9...v0.1.10