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
-Status: Ready to plan
-Last activity: 2026-02-16 — Roadmap created
+Plan: 1 of 3 in current phase
+Status: In progress
+Last activity: 2026-02-16 — Completed 01-01 (StepperInput components)
 
-Progress: [░░░░░░░░░░] 0%
+Progress: [█░░░░░░░░░] 11%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 0
-- Average duration: —
-- Total execution time: 0 hours
+- Total plans completed: 1
+- Average duration: 1 min
+- 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