docs(01-input-ux-01): complete stepper input components plan

- SUMMARY.md: documents StepperInput, WeightInput, RepsInput creation
- STATE.md: advanced to plan 1/3, added component decisions

.planning/STATE.md

@@ -10,27 +10,27 @@ See: .planning/PROJECT.md (updated 2026-02-15)
 ## Current Position
 
 Phase: 1 of 3 (Input UX)
-Plan: 0 of 3 in current phase
+Plan: 1 of 3 in current phase
-Status: Ready to plan
+Status: In progress
-Last activity: 2026-02-16 — Roadmap created
+Last activity: 2026-02-16 — Completed 01-01 (StepperInput components)
 
-Progress: [░░░░░░░░░░] 0%
+Progress: [█░░░░░░░░░] 11%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 0
+- Total plans completed: 1
-- Average duration: —
+- Average duration: 1 min
-- Total execution time: 0 hours
+- Total execution time: ~0.02 hours
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| - | - | - | - |
+| 01-input-ux | 1/3 | 1 min | 1 min |
 
 **Recent Trend:**
-- Last 5 plans: —
+- Last 5 plans: 01-01 (1 min)
 - Trend: —
 
 *Updated after each plan completion*
@@ -43,6 +43,9 @@ Progress: [░░░░░░░░░░] 0%
 - Frontend-only changes for Phase 1 (zero backend risk)
 - React Hook Form + Zod approved for input validation (research recommendation)
 - Do NOT modify shared program data — fork to custom_workout table for per-user changes
+- StepperInput is a pure controlled component — no internal useState, all state lives in parent
+- 44px minimum touch targets on stepper buttons for mobile usability; 16px font prevents iOS auto-zoom
+- Decimal step (2.5) uses inputMode=decimal; integer step uses inputMode=numeric
 
 ### Pending Todos
 
@@ -55,5 +58,5 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-02-16
-Stopped at: Roadmap created, ready to plan Phase 1
+Stopped at: Completed 01-01-PLAN.md (StepperInput, WeightInput, RepsInput components)
 Resume file: None

.planning/phases/01-input-ux/01-01-SUMMARY.md

@@ -0,0 +1,111 @@
+---
+phase: 01-input-ux
+plan: "01"
+subsystem: ui
+tags: [react, stepper, input, components, css]
+
+# Dependency graph
+requires: []
+provides:
+  - "StepperInput controlled component with +/- buttons, min/max clamping, aria support"
+  - "WeightInput wrapper (2.5kg steps, kg suffix)"
+  - "RepsInput wrapper (1 rep steps)"
+  - "Stepper CSS block in App.css (.stepper-wrapper, .stepper-btn, .stepper-input)"
+affects: [01-02, workout-page, set-logging]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Controlled stepper component: all state in parent, component is pure"
+    - "Wrapper component pattern: WeightInput/RepsInput configure StepperInput with domain defaults"
+
+key-files:
+  created:
+    - frontend/src/components/StepperInput.jsx
+    - frontend/src/components/WeightInput.jsx
+    - frontend/src/components/RepsInput.jsx
+  modified:
+    - frontend/src/App.css
+
+key-decisions:
+  - "StepperInput is a pure controlled component - no internal useState, all state lives in parent"
+  - "44px minimum touch targets on stepper buttons for mobile usability"
+  - "font-size 16px on input to prevent iOS auto-zoom"
+  - "Decimal step (2.5) uses inputMode=decimal; integer step uses inputMode=numeric"
+
+patterns-established:
+  - "Stepper wrapper pattern: domain-specific inputs (WeightInput, RepsInput) wrap generic StepperInput"
+  - "Negative input rejected via min clamping, not by blocking input events"
+
+# Metrics
+duration: 1min
+completed: 2026-02-16
+---
+
+# Phase 1 Plan 01: Stepper Input Components Summary
+
+**StepperInput controlled component with +/- 44px touch buttons, WeightInput (2.5kg steps) and RepsInput (1 rep steps) wrappers, and stepper CSS block added to App.css**
+
+## Performance
+
+- **Duration:** ~1 min
+- **Started:** 2026-02-16T07:02:46Z
+- **Completed:** 2026-02-16T07:04:13Z
+- **Tasks:** 2
+- **Files modified:** 4
+
+## Accomplishments
+- StepperInput: fully controlled component with +/- buttons, min/max clamping, 44px touch targets, 16px font, aria-labels, decimal/numeric inputMode
+- WeightInput: wrapper with step=2.5, suffix="kg", delegates all behavior to StepperInput
+- RepsInput: wrapper with step=1, no suffix, delegates all behavior to StepperInput
+- App.css: stepper styles appended cleanly at end of file, no existing CSS removed
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create StepperInput.jsx** - `912bd5d` (feat)
+2. **Task 2: WeightInput, RepsInput, stepper CSS** - `9fb8543` (feat)
+
+**Plan metadata:** see final commit below
+
+## Files Created/Modified
+- `frontend/src/components/StepperInput.jsx` - Reusable controlled stepper with +/- buttons, clamping, aria
+- `frontend/src/components/WeightInput.jsx` - Weight-specific wrapper (step=2.5, suffix=kg)
+- `frontend/src/components/RepsInput.jsx` - Reps-specific wrapper (step=1, no suffix)
+- `frontend/src/App.css` - Stepper styles appended (.stepper-wrapper through mobile @media block)
+
+## Decisions Made
+- StepperInput is a pure controlled component with no internal useState — keeps state management in parent, consistent with React best practices and plan specification
+- handleInputChange clamps to min (rejects negatives) rather than blocking keystrokes, so users can see feedback
+- inputMode switches between "numeric" and "decimal" based on whether step has fractional part
+
+## Deviations from Plan
+
+None - plan executed exactly as written. The build linter added `min-height: 44px` to `.start-btn` (a pre-existing class in App.css), which is a positive accessibility side effect and not a deviation from this plan's scope.
+
+## Issues Encountered
+The Edit tool hit a "file modified since read" error twice on App.css because the linter was modifying the file after each read. Resolved by using bash `cat >>` to append the CSS block directly, bypassing the read-then-edit cycle.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- StepperInput, WeightInput, and RepsInput are complete and ready for Plan 02 to integrate into WorkoutPage
+- Components are fully self-contained; Plan 02 only needs to import and drop them into the set rows
+- Build passes with no new errors or warnings
+
+---
+*Phase: 01-input-ux*
+*Completed: 2026-02-16*
+
+## Self-Check: PASSED
+
+- FOUND: frontend/src/components/StepperInput.jsx
+- FOUND: frontend/src/components/WeightInput.jsx
+- FOUND: frontend/src/components/RepsInput.jsx
+- FOUND: .planning/phases/01-input-ux/01-01-SUMMARY.md
+- FOUND: 912bd5d (Task 1 commit)
+- FOUND: 9fb8543 (Task 2 commit)