Allow dragging contacts between To, Cc and Bcc

[bcbetterninja]

Recipient chips could not be dragged between To, Cc, and Bcc because compose had no recipient drag/drop handlers. Dragging a Cc contact onto To now moves the existing chip, keeps its display name, and saves/sends it in the destination field. All six field-to-field moves are supported.

The destination highlights during an accepted drag. Pending text in both fields is preserved; an address already present in the destination is merged without a duplicate. Clicking a chip also keeps the recipient input focused for typing. Same-field, unrelated, stale, and cross-compose drops are rejected, and sending/uploading prevents recipient moves. Recipient transfers use an in-process format without exposing contact text to unrelated drop targets.

Validation:

• Latest CI passed on Windows, Linux, and macOS, including CodeQL.
• Solution and offline UI preview builds: zero warnings/errors.
• All 588 tests passed on the updated base, including nine recipient cases covering every direction, immediate autosave, sent recipients, quoted display names, duplicate addresses, and rejected/busy moves.
• Real X11 pointer regression passed chip-click typing focus in every field, all six To/Cc/Bcc moves, pending text, saved drafts, unrelated/same-field rejection, duplicate merging, and the remove button. Added to Linux PR checks.
• Existing real X11 compose keyboard regression passed typing, editing, undo, focus switching, and draft capture.
• The mail fallback regression now uses type:mail so unrelated workspace searches cannot reorder its collection during headless assertions. All 588 tests passed again, plus ten repeated runs of that regression.

Also includes the test-only Windows cleanup fix from PR #36: the temporary legacy recovery fixture disables SQLite pooling so mail.db can be deleted after disposal. This fixes the Windows blocker inherited from the merged PR #35 on the updated base.

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