test(e2e): add Playwright with browser tests for login, logo, dashboard

TODO.md

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+# Gravl PM - Active Task Queue
+
+## Current: 04-03 Frontend - Workout Edit Mode
+**Status:** IN PROGRESS (recovery from interruption)
+**Agent:** Frontend (Claude Code)
+**Directory:** /workspace/gravl/frontend
+
+### Tasks
+
+#### 1. Add "Edit Workout" Button
+- Add edit button/icon on WorkoutSelectPage for program workouts
+- Only show for workouts that are part of a program
+- Button triggers edit mode/modal
+
+#### 2. Create ExercisePicker Modal/Component
+- Modal for selecting exercises from the database
+- Search/filter functionality
+- Exercise list with categories
+- Select exercise with click/tap
+- Reuse existing exercise data from current workout flow
+
+#### 3. Implement Swap Exercise Flow
+- On exercise row in edit mode, show swap button
+- Open ExercisePicker modal
+- Replace selected exercise in workout structure
+- Maintain set/rep info where applicable
+
+#### 4. Implement Add Exercise Flow  
+- "Add Exercise" button at bottom of workout
+- Open ExercisePicker modal
+- Append new exercise to workout with default sets/reps
+- Allow configuring sets/reps for new exercise
+
+#### 5. Fork Confirmation Dialog
+- When user first modifies a program workout
+- Explain: "This creates your personal version of this workout"
+- Options: "Cancel", "Create My Version"
+- Show only once per workout (set flag)
+
+#### 6. Save Custom Workout
+- POST to /api/custom-workouts on first modification (creates fork)
+- PUT to /api/custom-workouts/:id on subsequent changes
+- Update local state to use custom_workout_id
+- Mark workout as "custom" in UI
+
+### API Endpoints Available (from 04-02)
+- POST   /api/custom-workouts          - Create custom workout from program
+- PUT    /api/custom-workouts/:id       - Update exercises
+- GET    /api/custom-workouts/:id       - Fetch with exercises
+- GET    /api/custom-workouts           - List user's custom workouts
+
+### Database Schema (from 04-01)
+- custom_workouts table with user_id, name, original_program_day_id
+- custom_workout_exercises table with exercise_id, set_order, sets, reps
+
+### Success Criteria
+- [ ] "Edit Workout" button visible on program workouts
+- [ ] Exercise picker modal opens and shows exercises
+- [ ] Can swap an exercise (replaces in workout)
+- [ ] Can add new exercise (appends to workout)
+- [ ] Fork confirmation shown on first edit
+- [ ] Custom workout saves to backend
+- [ ] Subsequent sessions use custom workout
+
+### Next After This
+- 04-04: Visual distinction (custom vs program badges)
+- 04-05: Reset to original program option