feat: complete mobile-first hacker-side redesign

[devin-ai-integration]

Summary

Complete mobile-first redesign of the hacker experience (white background, thin typography, shadcn/ui), wired to real backend data.

New backend endpoints (+ store methods, mocks, tests, swagger):

• GET /v1/schedule — authed hacker access reusing the existing schedule store
• GET /v1/notifications/feed — sent notifications where target_role IS NULL OR target_role = user.role, newest first, limit 50 (ScheduledNotificationsStore.ListSentForRole)
• DELETE /v1/users/me — hard-deletes the local user row (FK cascades remove application/scans/push subs), then best-effort deletes the SuperTokens account (UsersStore.Delete)

Frontend:

• HackerLayout: dark translucent pill bottom nav (mobile) / admin-style sidebar (desktop) with animated selection + page transitions; bottom nav hidden on /app/apply
• LoginPage: centered HARP layout, underline email input, black "Send magic link" pill, Google outline button (auth logic unchanged)
• Application wizard: full-screen per-section steps with thin top progress bar (StepIndicator), underline inputs, fixed bottom Continue/Submit pill (StepNavigation); goToNextStep validates + autosaves before advancing; review step with per-section Edit links (zod/autosave/resume-upload logic preserved)
• SchedulePage: day-view calendar from GET /schedule — day strip, hour axis, events positioned by time, now-line, dark filter popover with tag colors (required #FF0000, social #FFBB00, food #09D082, sponsor #00A8EB, workshop #A259FF, other #B8B8B8)
• NotificationsPage (/app/notifications): feed grouped Today/Yesterday/date; dashboard notification card + bell now use the real feed
• ProfilePage: avatar + name from application responses, expandable QR card (qrcode.react), Tavern Points placeholder, push-notification Switch (usePushSubscription), resume upload/delete (draft only), destructive delete-account AlertDialog → DELETE /users/me → sign out
• ScanPage: shows the hacker's own QR (user id) for check-in/meal scanning
• StatusPage: restyled status card + details rows with state-appropriate CTA

Tavern Points intentionally left as a placeholder per request.

Link to Devin session: https://app.devin.ai/sessions/c0d83fd075164074970aa8c305f07360
Requested by: @balebbae

[devin-ai-integration]

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