docs: add phase 3 design polish planning, update progress

.planning/phases/03-design-polish/03-00-OVERVIEW.md

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+# Phase 3: Design Polish & MVP
+
+**Started:** 2026-02-26
+**Goal:** Enterprise-quality look while maintaining MVP functionality
+
+## Problem Statement
+
+Current app looks like a "cheap template copy" - needs professional polish while keeping core functionality intact.
+
+## Design Philosophy
+
+- **Polish, don't rebuild** - Improve visual quality without breaking working features
+- **Enterprise feel** - Clean, sophisticated, not template-like
+- **Subtle animations** - Smooth transitions, not flashy
+- **Consistent spacing** - Professional rhythm and breathing room
+- **Better typography** - More hierarchy contrast
+
+## Phase Plans
+
+### 03-01: Login/Onboarding Polish
+- Auth pages visual upgrade
+- Better branding presence
+- Smoother form interactions
+
+### 03-02: Dashboard Polish
+- Header/brand refinement
+- Card improvements
+- Better visual hierarchy
+
+### 03-03: Workout Experience Polish
+- Exercise cards refinement
+- Set logging UX
+- Progress indicators
+
+## Success Criteria
+
+- [ ] App feels cohesive and professional
+- [ ] No "template" visual artifacts
+- [ ] Consistent spacing/sizing
+- [ ] Better typography hierarchy
+- [ ] Core flow (login → workout) works smoothly
+
+## Out of Scope
+
+- New features (only visual polish)
+- Backend changes
+- Database migrations