feat(profile): add Profile tab with mock data (LIM-279)

[devin-ai-integration]

Summary

Adds a tab bar to the app and a new Profile page reachable from it, per LIM-279.

• ContentView is now a TabView hosting two tabs:
  • Home (house SF Symbol) — the existing globe + "Hello, world!" content, moved into HomeView.
  • Profile (person.crop.circle SF Symbol) — new ProfileView showing mock data for Ada Lovelace (avatar, name/handle, account section, stats section).
• Mock profile data lives in a MockProfile struct with a .sample static instance.
• Each tab is wrapped in a NavigationStack so future per-tab navigation works correctly.
• No project.pbxproj edits required — the target uses PBXFileSystemSynchronizedRootGroup, so the new .swift files are picked up automatically.

Preview

• Home:
• Profile:
• Demo video (tab switching): https://app.devin.ai/attachments/26f99a76-d046-40c6-a7ec-039c76ded8e8/lim-279-demo.mp4
• Live preview build: https://console.limrun.com/preview?asset=sample-native-app-lim-279.zip&platform=ios

Review & Testing Checklist for Human

• Tab bar appears at the bottom with Home + Profile entries; Home shows on launch.
• Tapping the Profile tab navigates to the profile page and shows the mock data (Ada Lovelace, @ada, email, location, member since, stats).
• Switching back to Home preserves the original globe + greeting and the "Home" navigation title.
• Mock data placement, copy, and icons are acceptable as a starting point (happy to replace with real data / different design later).

Notes

• Risk: low/green — purely additive UI changes, no data layer, no behavior outside the two new screens.
• Mock content is deliberately minimal; real profile content / state can be wired in later.

Link to Devin session: https://app.devin.ai/sessions/e7b17ec8547c4df8a7f6204b3ca59032
Requested by: @muvaf

---

Note

Low Risk
Low risk UI-only changes that add new SwiftUI screens and navigation structure, with no backend/data-layer or security-sensitive logic touched.

Overview
Adds a bottom TabView navigation to ContentView with Home and Profile tabs.

Moves the existing “Hello, world!” UI into a new HomeView wrapped in a NavigationStack, and introduces a new ProfileView that renders mock profile/account/stats data from a local MockProfile.sample.

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[devin-ai-integration]

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