feat: add warnings when image upload fails during todo operations

SESSION.md

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+# Session State
+
+**Project**: fullstack-next-cloudflare (Open Source Contributions)
+**Repository**: https://github.com/ifindev/fullstack-next-cloudflare
+**Fork**: https://github.com/jezweb/fullstack-next-cloudflare
+**Current Phase**: UX Improvements
+**Last Checkpoint**: fa233f3 (2025-11-08)
+
+---
+
+## Completed PRs ✅
+
+### Phase 1: Quick Fixes (PRs #11-16)
+**Status**: Complete | **Date**: 2025-11-08
+
+1. **PR #11** - Auto-detect port in auth client
+   - Fixed hardcoded localhost:3000 to use window.location.origin
+   - Prevents port conflicts in development
+
+2. **PR #12** - Fix navigation link
+   - Changed /todos → /dashboard/todos (404 fix)
+
+3. **PR #13** - Fix typos in method names
+   - buildSystenPrompt → buildSystemPrompt
+   - styleInstructructions → styleInstructions
+
+4. **PR #14** - Replace alert() with toast
+   - delete-todo.tsx: alert() → toast.error()
+
+5. **PR #15** - Add ARIA labels
+   - Added aria-label to delete button for accessibility
+
+6. **PR #16** - Add file validation
+   - File size limit: 5MB
+   - File types: PNG, JPG only
+   - Toast error messages
+
+---
+
+### Phase 2: Medium-Difficulty Fixes (PRs #17-20)
+**Status**: Complete | **Date**: 2025-11-08
+
+7. **PR #17** - Fix R2 URL double https://
+   - File: src/lib/r2.ts
+   - Removed hardcoded https:// prefix (env var already includes it)
+
+8. **PR #18** - Database ID environment variable
+   - Files: drizzle.config.ts, .dev.vars.example, README.md
+   - Added CLOUDFLARE_D1_DATABASE_ID env var
+   - Replaced hardcoded database ID
+
+9. **PR #19** - NEXT_REDIRECT error handling
+   - File: src/modules/todos/actions/update-todo.action.ts
+   - Added NEXT_REDIRECT handling to match createTodoAction
+
+10. **PR #20** - Standardize error responses
+    - Files: create-category.action.ts, add-category.tsx
+    - Changed from throw pattern to { success, data?, error? } pattern
+    - Consistent with other mutations
+
+---
+
+### Phase 3: Documentation (PR #21)
+**Status**: Complete | **Date**: 2025-11-08
+
+11. **PR #21** - Complete API documentation
+    - File: docs/API_ENDPOINTS.md (872 lines)
+    - REST endpoints: /api/summarize, /api/auth/*
+    - Server actions: 11 actions documented
+    - Data models, error handling, examples
+
+---
+
+## Current Phase: UX Improvements 🔄
+
+### Planned PRs (Next 5)
+
+**PR #22** - Replace alert() with toast (remaining instances)
+- Files: toggle-complete.tsx
+- Estimated: 15 min
+
+**PR #23** - Add success feedback for todo create/edit
+- Files: todo-form.tsx, create-todo.action.ts, update-todo.action.ts
+- Add toast.success() before redirect
+- Estimated: 30 min
+
+**PR #24** - Image upload failure warnings
+- Files: create-todo.action.ts, update-todo.action.ts
+- Show toast when R2 upload fails
+- Estimated: 20 min
+
+**PR #25** - Loading state for image uploads
+- File: todo-form.tsx
+- Add loading indicator/progress
+- Estimated: 45 min
+
+**PR #26** - Theme-aware colors (optional)
+- Files: todo-card.tsx, dashboard.page.tsx
+- Replace hard-coded colors with semantic theme colors
+- Estimated: 45 min
+
+---
+
+## Key Files Reference
+
+**Actions**:
+- `src/modules/todos/actions/create-todo.action.ts`
+- `src/modules/todos/actions/update-todo.action.ts`
+- `src/modules/todos/actions/delete-todo.action.ts`
+- `src/modules/todos/actions/create-category.action.ts`
+
+**Components**:
+- `src/modules/todos/components/todo-form.tsx`
+- `src/modules/todos/components/todo-card.tsx`
+- `src/modules/todos/components/delete-todo.tsx`
+- `src/modules/todos/components/toggle-complete.tsx`
+- `src/modules/todos/components/add-category.tsx`
+
+**API Routes**:
+- `src/app/api/summarize/route.ts`
+- `src/app/api/auth/[...all]/route.ts`
+
+**Config**:
+- `drizzle.config.ts`
+- `wrangler.jsonc`
+- `.dev.vars.example`
+
+---
+
+## Development Setup
+
+**Dev Servers Running**:
+- Wrangler: Port 8787 (Bash 23e213)
+- Next.js: Port 3001 (Bash d83043)
+- Additional: Bash bc259d
+
+**Environment**:
+- Account ID: 0460574641fdbb98159c98ebf593e2bd
+- Database ID: 757a32d1-5779-4f09-bcf3-b268013395d4
+- Auth: Google OAuth configured
+
+---
+
+## Contribution Stats
+
+**Total PRs**: 11 submitted
+**Lines Changed**: ~1,500+ lines
+**Documentation Added**: 872 lines
+**Issues Fixed**: 15+
+
+**Focus Areas**:
+- Error handling consistency
+- Environment configuration
+- API documentation
+- User experience improvements
+
+---
+
+## Next Action
+
+**After context compact**: Continue with UX improvement PRs (#22-26)
+
+Start with PR #22: Replace remaining alert() calls with toast notifications in toggle-complete.tsx