aisman

Direct session 45, Step 1: Issue tab fixes and improvements:
- Fix 'Clear selections' button always disabled
- Fix add-issue mode: newly added issues not formatted correctly
- Persist add-issue mode in AimState across issue navigation
- Pre-select last manual tab when session loads from server
- Fix Filter-in-Issues toggle not persisting state
- Replace FontAwesome user icon in .aim-session-creator-avatar with SVG head outline
- Fix Workflow select-issues list respecting issue checkbox selection