feat(02-01): schema columns, PWA vitest harness, ICS fixtures, RED test stubs

- Add calendarEvents.hasRrule boolean + idx_calendar_events_has_rrule index (Phase 2 pre-filter)
- Add calendars.isShared boolean for shared-family calendar identification
- Create apps/pwa/vitest.config.ts with jsdom environment
- Add vitest, @testing-library/react, jsdom, @testing-library/jest-dom to PWA devDependencies
- Add "test": "vitest run" script to apps/pwa/package.json
- Create three ICS fixtures: weekly-dst.ics (DST spanning), allday-birthday.ics, exdate-series.ics
- Create RED test stub expand.test.ts with concrete DST wall-clock assertions (10:00 local both sides of March 2026 boundary)
- Create RED test stub events.test.ts with 400 validation and color/isShared field contracts
- Create RED test stub hydrateEvents.test.ts with Temporal type and calendarId routing contracts (shared→"shared", personal→String(ownerUserId))
- Create RED test stub calendarConfig.test.ts with firstDayOfWeek 0→7 translation contract

apps/pwa/src/lib/calendarConfig.test.ts

@@ -0,0 +1,51 @@
+/**
+ * RED test stubs for calendarConfig — Wave 0 state.
+ *
+ * These tests encode the contracts for calendarConfig.ts.
+ * The tests reference the not-yet-built module apps/pwa/src/lib/calendarConfig.ts.
+ *
+ * Contracts locked here:
+ *  1. WEEK_START_DAY === 0 (JS/date-fns Sunday convention) → Schedule-X firstDayOfWeek === 7
+ *     (Temporal convention: 7 = Sunday, not 0)
+ *     Passing 0 would silently default to Monday in Schedule-X v4.
+ */
+
+import { describe, it, expect } from 'vitest'
+
+// Not yet built — import will fail (RED state) until Plan 03 implements calendarConfig.ts
+import { WEEK_START_DAY, buildCalendarConfig } from './calendarConfig.js'
+
+describe('calendarConfig — RED stubs (Wave 0)', () => {
+
+  it('WEEK_START_DAY constant equals 0 (Sunday in JS/date-fns convention)', () => {
+    // The project uses 0 = Sunday (JS/date-fns convention).
+    // This constant is translated to 7 before passing to Schedule-X.
+    expect(WEEK_START_DAY).toBe(0)
+  })
+
+  it('WEEK_START_DAY=0 translates to Schedule-X firstDayOfWeek === 7', () => {
+    // Schedule-X v4 uses Temporal numbering: 1=Mon, 7=Sun.
+    // WEEK_START_DAY=0 (JS Sunday) must become 7 (Temporal Sunday).
+    // This avoids the Pitfall 1 silent failure where weeks start on Monday.
+    const config = buildCalendarConfig([])
+    expect(config.firstDayOfWeek).toBe(7)
+  })
+
+  it('buildCalendarConfig includes shared-family calendar with id "shared"', () => {
+    const config = buildCalendarConfig([])
+    expect(config.calendars).toHaveProperty('shared')
+    expect(config.calendars['shared'].colorName).toBe('shared')
+  })
+
+  it('buildCalendarConfig includes per-member calendars keyed by String(userId)', () => {
+    const members = [
+      { id: '1', name: 'Lucas', color: '#4A90D9' },
+      { id: '2', name: 'Spouse', color: '#E8734A' },
+    ]
+    const config = buildCalendarConfig(members)
+    expect(config.calendars).toHaveProperty('1')
+    expect(config.calendars).toHaveProperty('2')
+    expect(config.calendars['1'].lightColors.main).toBe('#4A90D9')
+    expect(config.calendars['2'].lightColors.main).toBe('#E8734A')
+  })
+})