Story 5.2: Video Widget Width Customization

Implements configurable video widget widths for small and large dock layouts:
- Add widgetWidthSm and widgetWidthMd world settings (defaults: 83px, 150px)
- Add width dropdown selectors in Director's Board UI
- Apply width settings to participant avatars via CSS custom properties
- Update strip width/height calculations to use custom widths
- Add localization strings for widget width settings
- Add CSS styling for widget width dropdown controls
- Fix Handlebars template syntax for select element selected values

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -35,7 +35,7 @@
 # - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
 
 generated: "2026-05-23T22:07:05+0000"
-last_updated: "2026-05-26T00:00:00+0000"
+last_updated: "2026-05-26T11:00:00+0000"
 project: video-view-manager
 project_key: NOKEY
 tracking_system: file-system
@@ -75,3 +75,5 @@ development_status:
   # Epic 5: Full AV Replacement
   epic-5: in-progress
   5-1-full-av-replacement: done
+  5-2-video-widget-width-customization: done
+  epic-5-retrospective: done