docs(06-04): complete phase 6 plan 4 summary

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/phases/06-video-and-polish/06-04-SUMMARY.md

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+# Phase 6 Plan 4 Summary: Error Handling & Polish
+
+**Completed:** 2026-01-11
+**Plan:** .planning/phases/06-video-and-polish/06-04-PLAN.md
+
+## Completed Tasks
+
+### Task 1: Improve Error Handling and Loading States
+- Added `modelsFetchError` state to GenerateImageNode and GenerateVideoNode
+- Added retry button when model fetch fails
+- Improved API error messages to include model name
+- Added rate limit (429) handling
+
+### Task 2: Parameter Validation and Defaults
+- Added inline validation for number/integer params with min/max bounds
+- Red border and error text for invalid values
+- Clear parameters when switching provider/model
+
+### Task 3: Final Cleanup and Testing
+- Added @deprecated JSDoc to NanoBananaNode alias
+- Added @deprecated to saveNanoBananaDefaults function
+- Build verification passed
+
+### Task 4: Human Verification
+- UAT completed with user testing
+- UAT-001 (fal.ai schema 404) discovered and fixed during verification
+- Two future enhancements logged
+
+## UAT Results
+
+**Passed:**
+- Pre-flight checks
+- Text-to-video generation
+- Error handling UI
+- Backward compatibility
+- Video download
+
+**Fixed During UAT:**
+- fal.ai parameter schema loading (was using wrong API endpoint)
+
+## Future Enhancements Logged
+
+1. **ENHANCE-001:** Dynamic model input handles based on schema
+   - Models like Kling 2.6 support multiple inputs (first/last frame, positive/negative prompt)
+   - Currently nodes have fixed generic inputs
+
+2. **ENHANCE-002:** Auto-resize node when expanding Parameters section
+   - Node height doesn't adjust when Parameters expands
+   - User must manually resize
+
+## Commits
+
+- `2810572` - feat(06-04): improve error handling for model fetching
+- `609ce62` - feat(06-04): add parameter validation with inline errors
+- `d5c777c` - chore(06-04): add deprecation notices to legacy aliases
+- `e8fe721` - fix(06-04): handle fal.ai 404 gracefully for models without schema
+- `913e6ee` - fix(06-04): use fal.ai Model Search API for parameter schema
+- `f59f4b0` - fix(06-04): correct fal.ai schema parsing for Model Search API
+- `8659c3a` - docs(06-04): log UAT results and future enhancements
+
+## Status
+
+**COMPLETE** - Phase 6 Plan 4 finished with all tasks done and UAT passed.