diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
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+# Roadmap: Node Banana Multi-Provider Support
+
+## Overview
+
+Transform Node Banana from a Gemini-only image generator into a multi-provider platform supporting Replicate and fal.ai. The journey builds provider infrastructure first, then adds dynamic model discovery, refactors the generate node for flexibility, creates a searchable model browser, adds local image serving for URL-based providers, and finishes with video support and polish.
+
+## Domain Expertise
+
+None
+
+## Milestones
+
+- ✅ **v1.0 Multi-Provider Support** - Phases 1-6 (shipped 2026-01-11)
+- ✅ **v1.1 Improvements** - Phases 7-14 (shipped 2026-01-12)
+- 🚧 **v1.2 Improvements** - Phases 15-20 (in progress)
+
+## Phases
+
+**Phase Numbering:**
+- Integer phases (1, 2, 3): Planned milestone work
+- Decimal phases (2.1, 2.2): Urgent insertions (marked with INSERTED)
+
+<details>
+<summary>✅ v1.0 Multi-Provider Support (Phases 1-6) - SHIPPED 2026-01-11</summary>
+
+### Phase 1: Provider Infrastructure
+**Goal**: Users can configure Replicate and fal.ai API keys in settings, with keys securely stored
+**Depends on**: Nothing (first phase)
+**Research**: Unlikely (internal UI patterns, Zustand state management)
+**Plans**: 2 plans
+
+Plans:
+- [x] 01-01: Provider settings UI in ProjectSetupModal
+- [x] 01-02: Provider abstraction layer and types
+
+### Phase 2: Model Discovery
+**Goal**: App can fetch and cache available models from enabled providers at runtime
+**Depends on**: Phase 1
+**Research**: Likely (external APIs)
+**Research topics**: Replicate model listing API endpoints, fal.ai model discovery endpoints, response schemas and pagination
+**Plans**: 3 plans
+
+Plans:
+- [x] 02-01: Replicate model fetching API route
+- [x] 02-02: fal.ai model fetching API route
+- [x] 02-03: Model caching and unified model interface
+
+### Phase 3: Generate Node Refactor
+**Goal**: NanoBanana node becomes GenerateImage node supporting any provider's image models
+**Depends on**: Phase 2
+**Research**: Unlikely (internal refactoring using existing patterns)
+**Design decision**: Separate nodes for image vs video generation (GenerateVideo added in Phase 6)
+**Plans**: 3 plans
+
+Plans:
+- [x] 03-01: Rename NanoBanana to GenerateImage, add model selector (image models only)
+- [x] 03-02: Provider-specific execution in generate API route
+- [x] 03-03: Backward compatibility for existing workflows
+
+### Phase 4: Model Search Dialog
+**Goal**: Users can browse models via floating action bar icons and searchable dialog
+**Depends on**: Phase 3
+**Research**: Unlikely (internal UI using React patterns)
+**Plans**: 2 plans
+
+Plans:
+- [x] 04-01: Floating action bar with provider icons
+- [x] 04-02: Model search dialog with filtering and selection
+
+### Phase 5: Image URL Server
+**Goal**: Local API endpoint serves workflow images as URLs for providers requiring URL inputs
+**Depends on**: Phase 3
+**Research**: Unlikely (Next.js API routes, existing patterns)
+**Plans**: 2 plans
+
+Plans:
+- [x] 05-01: Image serving endpoint and URL generation
+- [x] 05-02: Integration with generate node for URL-based providers
+
+### Phase 6: Video & Polish
+**Goal**: GenerateVideo node for video generation, video playback, custom parameters, edge cases
+**Depends on**: Phase 5
+**Research**: Likely (video handling)
+**Research topics**: HTML5 video element for base64/blob URLs, provider response formats for video content
+**Design decision**: GenerateVideo as separate node type (not combined with GenerateImage)
+**Plans**: 4 plans
+
+Plans:
+- [x] 06-01: GenerateVideo node with video-capable model selector
+- [x] 06-02: Video playback in output node
+- [x] 06-03: Custom model parameters from provider schemas
+- [x] 06-04: Edge case handling and final polish
+
+</details>
+
+<details>
+<summary>✅ v1.1 Improvements (Phases 7-14) - SHIPPED 2026-01-12</summary>
+
+**Milestone Goal:** Fix connection issues, improve error visibility, add video history, auto-size nodes, and polish UI
+
+#### Phase 7: Video Connections ✅
+
+**Goal**: Fix video handle connections to only allow valid targets (generateVideo, output)
+**Depends on**: Phase 6
+**Research**: Unlikely (internal connection validation patterns)
+**Plans**: 1 plan
+
+Plans:
+- [x] 07-01: Add video handle type and connection validation
+
+#### Phase 8: Error Display ✅
+
+**Goal**: Better error visibility with overlay display, not hidden by previous output
+**Depends on**: Phase 7
+**Research**: Unlikely (internal UI patterns)
+**Plans**: 1 plan
+
+Plans:
+- [x] 08-01: Error notifications with persistent toast and node overlays
+
+#### Phase 9: Video History ✅
+
+**Goal**: Add history carousel for generated videos matching image history pattern
+**Depends on**: Phase 8
+**Research**: Unlikely (existing image history pattern)
+**Plans**: 1 plan
+
+Plans:
+- [x] 09-01: Video history types, store support, load API, and carousel UI
+
+#### Phase 10: Node Autosizing ✅
+
+**Goal**: Auto-size nodes to output dimensions and aspect ratio
+**Depends on**: Phase 9
+**Research**: Unlikely (React Flow node sizing)
+**Plans**: 1 plan
+
+Plans:
+- [x] 10-01: Node dimension utility and auto-resize on output
+
+#### Phase 11: UI Polish ✅
+
+**Goal**: Flora UI alignment, header UI improvements, project settings, provider logos on nodes
+**Depends on**: Phase 10
+**Research**: Unlikely (internal UI work)
+**Plans**: 1 plan
+
+Plans:
+- [x] 11-01: Provider badges on nodes and header UI streamlining
+
+#### Phase 12: Model Improvements ✅
+
+**Goal**: Verify Replicate image models work, extend model cache TTL
+**Depends on**: Phase 11
+**Research**: Likely (Replicate API behavior verification)
+**Research topics**: Replicate image model endpoints, cache invalidation strategies
+**Plans**: 1 plan
+
+Plans:
+- [x] 12-01: Extended cache TTL, fixed isImageInput, fixed stale node data in execution
+
+#### Phase 13: Fix Duplicate Generations ✅
+
+**Goal**: Fix image deduplication - generations folder has duplicate images due to hashing failure
+**Depends on**: Phase 12
+**Research**: Likely (investigate current hashing implementation)
+**Research topics**: Current save-generation hashing logic, why duplicates are being created
+**Plans**: 1 plan
+
+Plans:
+- [x] 13-01: Add MD5 content hashing and deduplication to save-generation API
+
+#### Phase 14: Fix Drag-Connect Node Creation Bugs ✅
+
+**Goal**: Fix bugs with nodes created via drag-connect: (1) connection vanishes after selecting model from browser, (2) defaults to Gemini with missing model selector in header
+**Depends on**: Phase 13
+**Research**: Unlikely (React Flow connection state, node creation flow)
+**Research topics**: Connection state during node creation, model selection callbacks, createDefaultNodeData initialization
+**Plans**: 1 plan
+
+Plans:
+- [x] 14-01: Normalize dynamic handle IDs and fix connection persistence
+
+</details>
+
+### 🚧 v1.2 Improvements (In Progress)
+
+**Milestone Goal:** Add automated testing across the application and modularize large monolithic files for better maintainability
+
+#### Phase 15: Test Infrastructure
+
+**Goal**: Set up testing framework with Vitest and React Testing Library for Next.js 16
+**Depends on**: Phase 14
+**Research**: Likely (Vitest + Next.js 16 App Router setup)
+**Research topics**: Vitest configuration for Next.js 16, React Testing Library setup, test file organization
+**Plans**: TBD
+
+Plans:
+- [x] 15-01: React Testing Library setup and configuration
+
+#### Phase 16: Store Modularization ✅
+
+**Goal**: Break up workflowStore.ts into focused modules (execution, nodes, edges, persistence)
+**Depends on**: Phase 15
+**Research**: Unlikely (internal Zustand patterns)
+**Plans**: 1 plan
+
+Plans:
+- [x] 16-01: Extract localStorage helpers and node defaults to utility modules
+
+#### Phase 17: Component Tests
+
+**Goal**: Add tests for key node components and UI interactions
+**Depends on**: Phase 16
+**Research**: Unlikely (established React Testing Library patterns)
+**Plans**: TBD
+
+Plans:
+- [ ] 17-01: TBD (run /gsd:plan-phase 17 to break down)
+
+#### Phase 18: API Route Tests
+
+**Goal**: Add tests for generate, llm, and workflow API routes
+**Depends on**: Phase 17
+**Research**: Unlikely (Next.js API route testing patterns)
+**Plans**: TBD
+
+Plans:
+- [ ] 18-01: TBD (run /gsd:plan-phase 18 to break down)
+
+#### Phase 19: Type Refactoring
+
+**Goal**: Split types/index.ts into domain-specific type files (nodes, providers, workflow)
+**Depends on**: Phase 18
+**Research**: Unlikely (internal refactoring)
+**Plans**: TBD
+
+Plans:
+- [ ] 19-01: TBD (run /gsd:plan-phase 19 to break down)
+
+#### Phase 20: Integration Tests
+
+**Goal**: End-to-end workflow execution tests covering node connections and data flow
+**Depends on**: Phase 19
+**Research**: Unlikely (internal testing patterns)
+**Plans**: TBD
+
+Plans:
+- [ ] 20-01: TBD (run /gsd:plan-phase 20 to break down)
+
+## Progress
+
+**Execution Order:**
+Phases execute in numeric order: 1 → 2 → ... → 14 → 15 → 16 → 17 → 18 → 19 → 20
+
+| Phase | Milestone | Plans Complete | Status | Completed |
+|-------|-----------|----------------|--------|-----------|
+| 1. Provider Infrastructure | v1.0 | 2/2 | Complete | 2026-01-09 |
+| 2. Model Discovery | v1.0 | 3/3 | Complete | 2026-01-09 |
+| 3. Generate Node Refactor | v1.0 | 3/3 | Complete | 2026-01-09 |
+| 4. Model Search Dialog | v1.0 | 2/2 | Complete | 2026-01-09 |
+| 5. Image URL Server | v1.0 | 2/2 | Complete | 2026-01-09 |
+| 6. Video & Polish | v1.0 | 4/4 | Complete | 2026-01-11 |
+| 7. Video Connections | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 8. Error Display | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 9. Video History | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 10. Node Autosizing | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 11. UI Polish | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 12. Model Improvements | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 13. Fix Duplicate Generations | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 14. Fix Drag-Connect Node Creation Bugs | v1.1 | 1/1 | Complete | 2026-01-12 |
+| 15. Test Infrastructure | v1.2 | 1/1 | Complete | 2026-01-12 |
+| 16. Store Modularization | v1.2 | 1/1 | Complete | 2026-01-12 |
+| 17. Component Tests | v1.2 | 0/? | Not started | - |
+| 18. API Route Tests | v1.2 | 0/? | Not started | - |
+| 19. Type Refactoring | v1.2 | 0/? | Not started | - |
+| 20. Integration Tests | v1.2 | 0/? | Not started | - |
diff --git a/.planning/STATE.md b/.planning/STATE.md
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+# Project State
+
+## Project Reference
+
+See: .planning/PROJECT.md (updated 2026-01-09)
+
+**Core value:** Provider infrastructure that dynamically discovers models from external APIs, enabling users to access hundreds of image/video generation models without hardcoding schemas.
+**Current focus:** Testing and modularization (v1.2)
+
+## Current Position
+
+Phase: 16 of 20 (Store Modularization)
+Plan: 1 of 1 in current phase
+Status: Phase complete
+Last activity: 2026-01-12 - Completed 16-01-PLAN.md
+
+Progress: ████████░░ 80% (Phase 16 complete)
+
+## Performance Metrics
+
+**Velocity:**
+- Total plans completed: 24
+- Average duration: 7 min
+- Total execution time: 2.9 hours
+
+**By Phase:**
+
+| Phase | Plans | Total | Avg/Plan |
+|-------|-------|-------|----------|
+| 1. Provider Infrastructure | 2/2 | 14 min | 7 min |
+| 2. Model Discovery | 3/3 | 14 min | 4.7 min |
+| 3. Generate Node Refactor | 3/3 | 13 min | 4.3 min |
+| 4. Model Search Dialog | 2/2 | 17 min | 8.5 min |
+| 5. Image URL Server | 2/2 | 5 min | 2.5 min |
+| 6. Video & Polish | 4/4 | 43 min | 14.3 min |
+| 7. Video Connections | 1/1 | 4 min | 4 min |
+| 8. Error Display | 1/1 | 14 min | 14 min |
+| 9. Video History | 1/1 | 12 min | 12 min |
+| 10. Node Autosizing | 1/1 | 2 min | 2 min |
+| 11. UI Polish | 1/1 | 8 min | 8 min |
+| 12. Model Improvements | 1/1 | - | - |
+| 13. Fix Duplicate Generations | 1/1 | 1 min | 1 min |
+| 14. Fix Drag-Connect Bugs | 1/1 | 7 min | 7 min |
+| 15. Test Infrastructure | 1/1 | 3 min | 3 min |
+| 16. Store Modularization | 1/1 | 22 min | 22 min |
+
+**Recent Trend:**
+- Last 5 plans: 8 min, 1 min, 7 min, 3 min, 22 min
+- Trend: Larger refactoring tasks take longer but establish patterns
+
+## Accumulated Context
+
+### Decisions
+
+Decisions are logged in PROJECT.md Key Decisions table.
+Recent decisions affecting current work:
+
+- Gemini always enabled via env var (GEMINI_API_KEY), Replicate/fal.ai optional
+- API keys stored in localStorage under node-banana-provider-settings key
+- Local state in modal to avoid saving on every keystroke
+- Provider config pattern: {id, name, enabled, apiKey, apiKeyEnvVar?}
+- Provider registry uses self-registration pattern via registerProvider()
+- Gemini remains special-cased in /api/generate for now, not yet migrated
+- Capability inference from model name/description keywords
+- fal.ai API key optional (works without but rate limited)
+- fal.ai auth header: "Key {apiKey}" format (not Bearer)
+- fal.ai category maps directly to ModelCapability (no inference)
+- 1-hour cache TTL for model lists (extended from 10 min)
+- Unified API at /api/models with header-based auth
+- Provider dropdown shows Gemini always, others only if API key configured
+- Aspect ratio/resolution controls shown only for Gemini provider
+- Backward compatibility via aliases: NanoBananaNode, saveNanoBananaDefaults
+- Server-side provider execution in API route (not client-side)
+- Header-based API key passing: X-Replicate-API-Key, X-Fal-API-Key
+- fal.ai sync API (fal.run) instead of queue-based async
+- Dual migration approach: loadWorkflow migrates + UI effect for runtime
+- fal.ai icon always visible in action bar (works without key but rate limited)
+- Replicate icon only visible when API key is configured
+- Client-side search filtering for Replicate (their search API unreliable)
+- Show all capability badges to differentiate similar models
+- Extract variant suffix from fal.ai model IDs for display name
+- No TTL for image store - explicit cleanup pattern (callers delete after use)
+- 256KB threshold for shouldUseImageUrl (Replicate recommendation)
+- Gemini excluded from video node (doesn't support video generation)
+- Large videos (>20MB) return URL instead of base64 to avoid memory issues
+- Fetch schema from provider API at model selection time with 10-min cache
+- Filter internal params, prioritize user-relevant ones (seed, steps, guidance)
+- Collapsible parameters section to keep node UI compact
+- Node autosizing constraints: 200-500px width, 200-600px height, ~100px chrome
+- Provider badges prepend node title (left side) with w-4 h-4 icons
+- Node titles show only model name (no "Generate Image/Video" prefix)
+- BaseNode supports titlePrefix prop for icon prepending
+- Header aligned for saved/unsaved states with same icon layout
+- isImageInput() uses word-boundary checks (not substring) to avoid matching num_images
+- Workflow execution gets fresh node data from store (not stale captured array)
+- regenerateNode includes parameters in request body
+- MD5 content hashing for generation deduplication (fast, collision resistance not critical)
+- Hash prefix in filename for O(1) duplicate lookup
+- Normalized handle IDs (image, text, image-0) for connection stability across model changes
+- Handle-to-schema mapping built at execution time from inputSchema
+- Placeholder handles (dimmed 30%) for input types not used by model, preserving connections
+- ReactFlowProvider wrapper for component tests using @xyflow/react hooks
+- Zustand store mocking with vi.mock pattern returning mocked functions
+- Vitest jsdom environment for React component tests
+- Store utilities extracted to src/store/utils/ with re-exports for backward compatibility
+- Consolidated defaultNodeDimensions (was duplicated in addNode and createGroup)
+- localStorage mocking pattern for testing utility modules
+
+### Deferred Issues
+
+- UAT-001: Resolved - Provider icons now use real Replicate/fal.ai logos
+- ISS-001: Resolved - Generate nodes now adapt to model requirements via dynamic parameters
+
+### Blockers/Concerns
+
+- Pre-existing lint configuration issue (ESLint not configured). Not blocking development.
+
+### Roadmap Evolution
+
+- v1.0 Multi-Provider Support shipped: 6 phases (Phase 1-6), 15 plans
+- Milestone v1.1 Improvements created: 6 phases (Phase 7-12), improvements and polish
+- Phase 13 added: Fix duplicate generations (hashing failure investigation)
+- Phase 14 added: Fix drag-connect node creation bugs (consolidated from two phases)
+- Milestone v1.2 Improvements created: 6 phases (Phase 15-20), testing and modularization
+
+## Session Continuity
+
+Last session: 2026-01-12
+Stopped at: Phase 16 complete
+Resume file: None
+Next action: Plan Phase 17 (run /gsd:plan-phase 17)
diff --git a/.planning/phases/16-store-modularization/16-01-SUMMARY.md b/.planning/phases/16-store-modularization/16-01-SUMMARY.md
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+---
+phase: 16-store-modularization
+plan: 01
+subsystem: store
+tags: [zustand, localStorage, refactoring, testing, modularization]
+
+# Dependency graph
+requires:
+  - phase: 15-test-infrastructure
+    provides: Vitest testing framework and patterns
+provides:
+  - localStorage utilities module (src/store/utils/localStorage.ts)
+  - Node defaults module (src/store/utils/nodeDefaults.ts)
+  - Unit tests for both modules (35 total)
+  - Shared defaultNodeDimensions (consolidated from duplicates)
+affects: [store-modularization, component-tests, api-route-tests]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Store utility extraction pattern (pure functions in utils/)
+    - Re-export for backward compatibility
+    - localStorage mocking with vi.stubGlobal
+
+key-files:
+  created:
+    - src/store/utils/localStorage.ts
+    - src/store/utils/nodeDefaults.ts
+    - src/store/utils/__tests__/localStorage.test.ts
+    - src/store/utils/__tests__/nodeDefaults.test.ts
+  modified:
+    - src/store/workflowStore.ts
+
+key-decisions:
+  - "Consolidated defaultNodeDimensions (was duplicated in addNode and createGroup)"
+  - "Re-export functions from workflowStore for backward compatibility"
+  - "Fixed createGroup missing generateVideo node type in dimensions"
+
+patterns-established:
+  - "Store utilities live in src/store/utils/"
+  - "Tests for store utilities use in-memory localStorage mock"
+
+issues-created: []
+
+# Metrics
+duration: 22min
+completed: 2026-01-12
+---
+
+# Phase 16 Plan 01: Extract localStorage and Node Defaults Summary
+
+**Extracted 239 lines from workflowStore.ts into focused utility modules with 35 new tests**
+
+## Performance
+
+- **Duration:** 22 min
+- **Started:** 2026-01-12T18:25:43Z
+- **Completed:** 2026-01-12T18:47:24Z
+- **Tasks:** 3
+- **Files modified:** 4 created, 1 modified
+
+## Accomplishments
+
+- Extracted all localStorage helpers into `src/store/utils/localStorage.ts` (130 lines)
+- Extracted node creation utilities into `src/store/utils/nodeDefaults.ts` (120 lines)
+- Created 35 unit tests for extracted modules (19 localStorage + 16 nodeDefaults)
+- Consolidated duplicated defaultNodeDimensions constant
+- Fixed missing generateVideo type in createGroup's dimension lookup
+- Maintained full backward compatibility via re-exports
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create store utilities module** - `836c77e` (refactor)
+2. **Task 2: Create node defaults module** - `cf66751` (refactor)
+3. **Task 3: Add unit tests for extracted modules** - `3d5cde7` (test)
+
+## Files Created/Modified
+
+- `src/store/utils/localStorage.ts` - Storage keys, workflow configs, cost data, provider settings helpers
+- `src/store/utils/nodeDefaults.ts` - createDefaultNodeData, defaultNodeDimensions, GROUP_COLORS
+- `src/store/utils/__tests__/localStorage.test.ts` - 19 tests for localStorage utilities
+- `src/store/utils/__tests__/nodeDefaults.test.ts` - 16 tests for node defaults utilities
+- `src/store/workflowStore.ts` - Reduced from 2786 to 2547 lines (-239)
+
+## Decisions Made
+
+- Consolidated defaultNodeDimensions: Previously duplicated in addNode and createGroup with inconsistency (createGroup was missing generateVideo)
+- Re-export strategy: Functions like `saveNanoBananaDefaults`, `generateWorkflowId`, `GROUP_COLORS` re-exported from workflowStore for existing import compatibility
+- Type assertions remain in workflowStore: Node data type imports kept since they're used for runtime type assertions in getConnectedInputs and executeWorkflow
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Fixed missing generateVideo in createGroup dimensions**
+- **Found during:** Task 2 (Node defaults extraction)
+- **Issue:** createGroup's local defaultNodeDimensions was missing generateVideo type, causing fallback to generic {300, 280}
+- **Fix:** Consolidated to shared defaultNodeDimensions that includes all 8 node types
+- **Files modified:** src/store/utils/nodeDefaults.ts, src/store/workflowStore.ts
+- **Verification:** TypeScript compilation passes, groups with video nodes size correctly
+- **Committed in:** cf66751 (Task 2 commit)
+
+---
+
+**Total deviations:** 1 auto-fixed (bug), 0 deferred
+**Impact on plan:** Bug fix was essential for consistency. No scope creep.
+
+## Issues Encountered
+
+None - plan executed smoothly.
+
+## Next Phase Readiness
+
+- Store utilities extracted and tested
+- 147 total tests passing (112 existing + 35 new)
+- Pattern established for future store modularization
+- Ready for Phase 17 (Component Tests) or continued Phase 16 work on execution/persistence extraction
+
+---
+*Phase: 16-store-modularization*
+*Completed: 2026-01-12*