feat(dashboard): wire 4 home-grid TODO tiles + dock notifications (E11.S01)

[abdout]

Story: E11.S01 (Phase 1 Pilot v1, Sprint P3)
Epic: EPIC-PROD-11 Dashboard & Navigation
Points: 5

Problem

Six tap targets on the iOS-style home grid + dock + search are stubbed with /* TODO */ placeholders today, so a pilot user tapping any of them gets visual feedback but no navigation:

• home-tile-spec.kt:114 — Notifications tile
• home-tile-spec.kt:122 — Exams tile
• home-tile-spec.kt:132 — Assignments tile
• home-tile-spec.kt:147 — Events tile
• dashboard-screen.kt:73 — Universal search pill (Spotlight)
• dashboard-screen.kt:96 — Notifications dock item

For pilot Seat 1 (King Fahad parent persona), the Notifications + Events + Exams tiles all front-line announcements/schedule that the school is already publishing — these tap-throughs are the daily-use surface.

Fix

• Thread onNavigateToNotifications, onNavigateToExams, onNavigateToEvents lambdas through the dashboard chain (dashboard-nav-graph → DashboardScreen → HomeScreen → buildHomeTiles)
• Wire 4 of the 6 TODOs to their destinations:
  • Notifications tile → Notifications route (feature/notifications)
  • Notifications dock item → Notifications route (same)
  • Exams tile → Exams route (feature/exams)
  • Events tile → EventsList route (feature/events)
• Replace the remaining 2 /* TODO */ strings with explicit comments naming the blocking work:
  • Universal search pill — E11.S02 (Phase 3 polish); kept as no-op so the pill keeps its grid slot
  • Assignments tile — no feature/assignments module exists; folds into E14 grading/exams alongside teacher grade entry

Atomic-pattern + reusability notes

• HomeTileSpec (data) → HomeTile (composable) → BadgedAppIcon (atom) — chain stays intact; no atom changes
• Navigation lambdas plumb through the same shape as existing tiles so the grid composition stays uniform
• Source of truth for tile destinations remains home-tile-spec.kt + HogwartsNavHost.dashboardScreen()

Acceptance criteria

• Tap Notifications tile → opens notifications screen
• Tap Notifications dock item → opens notifications screen
• Tap Exams tile → opens exams list
• Tap Events tile → opens events list
• Tap Universal search pill → no-op (E11.S02 deferred)
• Tap Assignments tile → no-op (deferred)
• No TODO: strings remain in the dashboard module

Reference

• Atomic + structure conventions: https://ed.databayt.org/en/docs/architecture · https://ed.databayt.org/en/docs/structure
• Visual: iPad/iOS 26 home Figma — tiles + Smart Stack widget intact

Source: .bmad/epics/epic-prod-11-dashboard-navigation.md