Retry through Codex composer drafts

[makerjackie]

What changed

• continue Auto Retry even when the target Codex composer contains a draft
• capture the draft before replacing the composer with the retry prompt
• restore the draft after submission when the composer becomes empty again
• never overwrite newer text that appears while restoration is pending
• remove the draft-protection paused state
• loosen the overly strict focused-element equality check that caused valid composers to be rejected
• bump the app to 0.8.3 (build 15)

User impact

A draft no longer blocks a detected capacity retry. Helper submits the continuation first and makes a best-effort attempt to put the original draft back into the composer. Failure to restore the draft does not cancel the retry.

Validation

• ./test.sh
• git diff --check
• self-tests cover placeholder classification and draft capture