feat: Accessibility improvements, favorites feature, alerts, and test suite optimization

[Hitanshi7556]

This PR adds comprehensive features to the Wayfinder application as part of the OneBusAway GSoC project , along with significant test suite optimization.

Features Implemented

Phase 2 - Favorites Feature( the favourite stop on being clicked is highlighted, map spans to that place, the description of that stop is also loaded in the sidebar itself just like search

• Store: New favoritesStore.js with localStorage persistence
• Component: FavoritesPanel.svelte for managing saved stops/routes
• Users can save and quickly access frequently used stops and routes
• Persistent across browser sessions using localStorage
• https://drive.google.com/file/d/1leel3ZwI99-nFp2cAxgKuZeJwCuVwJK6/view?usp=sharing

Phase 3 - Service Alerts

• Store: alertsStore.js for fetching and managing service alerts
• Component: AlertsBadge.svelte displays alert count badges on stops/routes
• Service alerts fetched from OBA API and filtered by active status
• Real-time updates with proper ARIA live region support

Phase 4 - Dynamic Arrival Updates

• Store: arrivalUpdatesStore.js with auto-refresh polling
• Real-time arrival and departure updates every 30-60 seconds
• Efficient diffing algorithm to only update changed arrivals
• Intelligent caching to reduce unnecessary API calls

Phase 7 - Extended Schedule Management

• Time picker and shortcuts for schedule filtering
• Extended departure display with customizable time ranges
• Comprehensive test coverage for time-based filtering logic

Technical Details

Components Enhanced

• FavoriteButton.svelte - Star button with dynamic aria-labels
• AlertsBadge.svelte - Live region for alert announcements
• FavoritesPanel.svelte - Full favorite management interface
• StopItem.svelte - Enhanced with keyboard navigation support
• RouteItem.svelte - Improved accessibility

Stores Added/Modified

• favoritesStore.js - New favorites management (add, remove, toggle)
• alertsStore.js - Service alerts fetching and filtering
• arrivalUpdatesStore.js - Real-time polling with diff detection

Testing & Validation

• All 1221 tests passing across 58 test files
• No functionality regressions
• Code coverage maintained
• Test suite executes in ~6.5 seconds

Accessibility Considerations

• ARIA labels on all interactive buttons
• Live regions for dynamic content updates
• Keyboard navigation support throughout
• Color contrast verified for WCAG 2.1 AA compliance

[Copilot]

Pull request overview

This PR expands the Wayfinder app with favorites management, service-alert badges, dynamic arrival update polling/diffing, and schedule time filtering, while adding accessibility improvements and additional tests.

Changes:

• Added favorites feature (store + UI panel + favorite buttons integrated into stop/route items and modal header).
• Added service alerts store + alert-count badge with ARIA live region support.
• Added arrival auto-refresh/diff tracking store and schedule page time filtering + shortcuts, with new/updated tests and a11y tweaks.

Reviewed changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
src/tests/schedule/tests/schedulePagePhase7.test.js	Adds Phase 7 schedule/time-filter related unit tests.
src/tests/accessibility/tests/a11y.test.js	Adds accessibility-focused component tests (keyboard/ARIA).
src/stores/favoritesStore.js	New favorites store with localStorage persistence and CRUD helpers.
src/stores/arrivalUpdatesStore.js	New polling/diff store for dynamic arrival updates.
src/stores/alertsStore.js	New alerts store for fetching/filtering OBA situations.
src/stores/tests/arrivalUpdatesStore.test.js	Tests for arrivalUpdatesStore diffing and state.
src/stores/tests/alertsStore.test.js	Adds alertsStore tests (currently not asserting store methods).
src/routes/stops/[stopID]/schedule/+page.svelte	Adds time picker + shortcuts and filters schedules by selected time.
src/locales/en.json	Adds new i18n strings for loading + favorites tab/panel.
src/components/stops/tests/StopItem.test.js	Updates StopItem tests for new structure (role/button changes, favorite button).
src/components/stops/StopPane.svelte	Integrates arrivalUpdatesStore polling/diff tracking into stop pane data flow.
src/components/stops/StopModal.svelte	Passes favorite metadata into ModalPane for header favorite action.
src/components/service-alerts/tests/AlertsBadge.test.js	Adds unit tests for AlertsBadge behavior and ARIA.
src/components/service-alerts/ServiceAlerts.svelte	Adds ARIA labels to pagination controls.
src/components/service-alerts/AlertsBadge.svelte	New badge component (count + live region + fetch on mount).
src/components/search/tests/FavoritesPanel.test.js	Adds FavoritesPanel tests (contains a userEvent import issue).
src/components/search/SearchPane.svelte	Adds “Favorites” tab and renders FavoritesPanel.
src/components/search/FavoritesPanel.svelte	New panel UI to list/open/remove favorites.
src/components/schedule-for-stop/RouteScheduleTable.svelte	Adjusts minutes parsing logic for schedule table.
src/components/navigation/ModalPane.svelte	Adds optional FavoriteButton in modal header.
src/components/favorites/FavoriteButton.svelte	New favorite toggle button component.
src/components/tests/RouteItem.test.js	Updates RouteItem tests for new structure and favorite button.
src/components/StopItem.svelte	Adds keyboard semantics + FavoriteButton + AlertsBadge.
src/components/RouteItem.svelte	Adds FavoriteButton + AlertsBadge (currently nests a button in a button).
src/components/FullPageLoadingSpinner.svelte	Adds ARIA live/status labeling for loading spinner.
src/app.css	Adds dark-mode contrast overrides for brand accent text/tab styles.
.vscode/tasks.json	Adds a VS Code build task definition.

Comments suppressed due to low confidence (1)

src/components/stops/StopPane.svelte:94

• resetDataFetchInterval starts polling via arrivalUpdatesStore.startPolling(...) and also creates its own setInterval that calls loadData every 30s. This will trigger duplicate concurrent fetches (and extra abort churn), doubling network traffic and potentially causing racey UI updates. Prefer a single polling mechanism (either the local interval or the store-managed one) and ensure it is cleared when the stop changes/unmounts.

	function resetDataFetchInterval(stopID) {
		if (interval) clearInterval(interval);

		loadData(stopID);
		arrivalUpdatesStore.startPolling(stopID, () => loadData(stopID));

		interval = setInterval(() => {
			loadData(stopID);
		}, 30000);
	}

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