aisman

Session 147, Step 16: Fix `_wfS4OriginalCreditValue` scoping error causing Process button failure
- AIM-3011 Fix `_wfS4OriginalCreditValue` scoping error causing Process button failure
- AIM-3012 Fix `detail` reference error in `updateSessionBadgeFromData`
- AIM-3013 Fix Process button staying disabled after credit dialog dismiss
- AIM-3014 Fix `_getCreditMode` not detecting Used mode for type5 providers
- AIM-3015 Fix credit dialog Step cost not auto-calculating in Used mode
- AIM-3016 Fix output JSON `reason` field and remove server-injected error metadata
- AIM-3017 Fix toolbar auto-select deselecting element and stealing focus
- AIM-3025 Wire Alt+Delete to delete annotation elements from text inputs
- AIM-3026 Enhance sidebar thumbnails with title + filename and description preview
- AIM-3027 Change Close button to neutral gray color
- AIM-3028 Fix orphaned SCSS scrollbar styles and garbage text in crop JS

Outcome:
All15 fixes and enhancements implemented. SCSS compiles, JS validates, minified bundles rebuilt.