docs: create milestone v1.3 roadmap (2 phases)

Phases:
17. Unit Tests (Jest): UNIT-01, UNIT-02, UNIT-03
18. Integration Tests (Playwright): INT-01, INT-02, INT-03

All 6 requirements mapped to phases.

.planning/ROADMAP.md

@@ -13,6 +13,7 @@ None
 - ✅ **v1.0 Media Players** - Phases 1-5 (shipped 2026-01-14)
 - ✅ **v1.1 Music Session Chat** - Phases 6-11 (shipped 2026-01-31)
 - ✅ **v1.2 Session Attachments** - Phases 12-16 (shipped 2026-02-07)
+- 🚧 **v1.3 Session Settings Tests** - Phases 17-18 (in progress)
 
 ## Phases
 
@@ -66,6 +67,13 @@ Decimal phases appear between their surrounding integers in numeric order.
 
 </details>
 
+### 🚧 v1.3 Session Settings Tests (Phases 17-18) - IN PROGRESS
+
+**Milestone Goal:** Add test coverage for the Session Settings modal component (JKSessionSettingsModal) to enable confident changes.
+
+- [ ] **Phase 17: Unit Tests (Jest)** - Component rendering, save payload, loading state
+- [ ] **Phase 18: Integration Tests (Playwright)** - Settings button, save API call, cancel behavior
+
 ## Phase Details
 
 ### ✅ v1.0 Media Players - SHIPPED 2026-01-14
@@ -311,10 +319,48 @@ Plans:
 
 </details>
 
+### 🚧 v1.3 Session Settings Tests (Phases 17-18) - IN PROGRESS
+
+**Milestone Goal:** Add test coverage for the Session Settings modal component (JKSessionSettingsModal) to enable confident changes.
+
+#### Phase 17: Unit Tests (Jest)
+**Goal**: Create Jest unit tests for JKSessionSettingsModal component covering critical paths
+**Depends on**: Phase 16 (previous milestone complete)
+**Research**: Unlikely (testing patterns established in codebase)
+**Requirements**: UNIT-01, UNIT-02, UNIT-03
+**Plans**: 1 plan
+
+**Success Criteria:**
+1. Test file created at `jam-ui/src/components/client/__tests__/JKSessionSettingsModal.test.js`
+2. UNIT-01: Test verifies modal renders with currentSession props (privacy, description values displayed)
+3. UNIT-02: Test verifies save button calls onSave with correctly transformed payload (privacy number, description)
+4. UNIT-03: Test verifies loading state disables form interactions (save button disabled, inputs disabled)
+5. All tests pass with `npm run test:unit`
+
+Plans:
+- [ ] 17-01-PLAN.md — Jest unit tests for JKSessionSettingsModal
+
+#### Phase 18: Integration Tests (Playwright)
+**Goal**: Create Playwright integration tests for Session Settings modal user flows
+**Depends on**: Phase 17
+**Research**: Unlikely (Playwright patterns established in codebase)
+**Requirements**: INT-01, INT-02, INT-03
+**Plans**: 1 plan
+
+**Success Criteria:**
+1. Test file created at `jam-ui/test/session-settings/session-settings.spec.ts`
+2. INT-01: Test verifies Settings button in session toolbar opens modal
+3. INT-02: Test verifies save settings makes PUT /sessions/{id} API call with correct data
+4. INT-03: Test verifies cancel closes modal without making API call
+5. All tests pass with `npx playwright test session-settings`
+
+Plans:
+- [ ] 18-01-PLAN.md — Playwright integration tests for Session Settings modal
+
 ## Progress
 
 **Execution Order:**
-Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 9 → 10 → 11 → 12 → 13 → 14 → 15 → 16
+Phases execute in numeric order: 1 → 2 → ... → 16 → 17 → 18
 
 | Phase | Milestone | Plans Complete | Status | Completed |
 |-------|-----------|----------------|--------|-----------|
@@ -334,3 +380,5 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
 | 14. Chat Integration & Display | v1.2 | 3/3 | Complete | 2026-02-06 |
 | 15. Real-time Synchronization | v1.2 | 1/1 | Complete | 2026-02-06 |
 | 16. Attachment Finalization | v1.2 | 2/2 | Complete | 2026-02-07 |
+| 17. Unit Tests (Jest) | v1.3 | 0/1 | Pending | — |
+| 18. Integration Tests (Playwright) | v1.3 | 0/1 | Pending | — |

.planning/STATE.md

@@ -9,10 +9,10 @@ See: .planning/PROJECT.md (updated 2026-02-07)
 
 ## Current Position
 
-Phase: Not started (defining requirements)
-Plan: —
-Status: Defining requirements
-Last activity: 2026-02-07 — Milestone v1.3 started
+Phase: 17 (Unit Tests)
+Plan: Not started
+Status: Ready to plan Phase 17
+Last activity: 2026-02-07 — Roadmap created
 
 Progress: ░░░░░░░░░░░░ 0%