Fix Codex auto retry submission

[makerjackie]

What changed

• locate the target Codex ProseMirror composer instead of relying on whichever control happens to be focused
• treat Codex's localized empty-composer placeholder as empty while preserving real drafts
• expose detected, scheduled, submitted, paused, and blocked retry states in the app UI
• replace the 12-task test picker with a searchable picker backed by up to 2,000 indexed tasks
• bump the app to 0.8.2 (build 14)

Root cause

Codex exposes Ask for follow-up changes as the Accessibility value of an empty ProseMirror editor. The old guard interpreted that placeholder as a user draft and cancelled every retry after successfully detecting the capacity error. The end-to-end picker separately used a hard-coded 12-item limit.

Validation

• ./test.sh
• live read-only Accessibility inspection confirmed the current composer is a settable ProseMirror text area inside composer-surface-chrome
• git diff --check