Session issues fixed:
- Removed auto-draft-only gate for showing unassigned sessions on new posts
(now shows on any post that has no linked sessions)
- Auto-link unassigned session to current post when user opens it
- Added beforeunload/pagehide flush to persist messages before page close
(prevents data loss from 700ms debounce not firing)
- Added warning log when session loads with 0 messages for debugging
UI fix:
- Override WP editor h3 shrinkage (11px/uppercase → 15px/normal/white)
- Fix h2/h4-h6 headings in response content for dark theme readability
Outline error messages:
- Separate empty response from parse failure with distinct actionable messages
- Show model name + token count on empty response for debugging
- Reassure user that parse failures are usually one-time issues
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