docs(29): research, validation, and 4 plans for image presentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -4,10 +4,10 @@ milestone: v2.2
 milestone_name: User Experience Polish
 status: executing
 stopped_at: Phase 29 context gathered
-last_updated: "2026-04-12T17:42:16.111Z"
-last_activity: 2026-04-12
+last_updated: "2026-04-12T17:51:24.659Z"
+last_activity: 2026-04-12 -- Phase 29 planning complete
 progress:
-  total_phases: 34
+  total_phases: 35
   completed_phases: 21
   total_plans: 58
   completed_plans: 56
@@ -27,8 +27,8 @@ See: .planning/PROJECT.md (updated 2026-04-09)
 
 Phase: 999.1
 Plan: Not started
-Status: Executing Phase 28
-Last activity: 2026-04-12
+Status: Ready to execute
+Last activity: 2026-04-12 -- Phase 29 planning complete
 
 Progress: [░░░░░░░░░░] 0%