Build a TikTok Clone App in Swift with AI

Build a polished, fully working native iOS app in SwiftUI named Clipzy: an original short-video social app that recreates the core experience of TikTok, but with its own name, its own original logo and its own color palette. Do NOT use the TikTok name, logo, wordmark, app icon or any trademarked asset anywhere in the app. Design an original Clipzy logo mark, drawn with SwiftUI shapes (Path/Canvas) or made as a generated image asset, and use it in the header.

Screens and flows (dark theme on the feed; bottom bar: Home, Friends, a center create button in your own two-tone style, Inbox, Profile):
1. Feed: full-screen vertical video pager that snaps one video per screen (a vertical ScrollView with .scrollTargetBehavior(.paging) and .scrollPosition, or a rotated TabView), autoplays muted-by-default video with a mute toggle, loops, and pauses when off screen. Use these verified free stock clips with AVPlayer (an AVPlayerLayer in a UIViewRepresentable, aspect-fill, no system controls): https://assets.mixkit.co/videos/<ID>/<ID>-720.mp4, poster https://assets.mixkit.co/videos/<ID>/<ID>-thumb-720-0.jpg, IDs 4823, 51314, 51295, 4702, 40367, 452, 52079, 34382, 36924, 47555 (curl-check them; drop any that fail). Top, fixed above the pager (render it once as an overlay, not inside each page): "Following | For You" tabs with an animated underline (For You default), LIVE badge left, search icon right.
2. Each video overlay: right rail with creator avatar plus an accent-colored "+" follow badge that turns into a check when tapped, heart with count (tap fills with a pop, count +1), comments with count, bookmark with count, share with count, and a spinning record disc at the bottom. Bottom-left: @username, caption with #hashtags and "more", a scrolling "original sound - username" marquee. Thin progress bar above the tab bar.
3. Double-tap anywhere on a video drops a tilted heart burst at the tap point and likes it. Single tap pauses with a big translucent play icon; tap again resumes.
4. Comments: the comment icon opens a bottom sheet "1,284 comments" with 15 comments (avatar, name, text, time, reply, like with count), pinned creator reply, and an input; posting adds yours on top.
5. Share sheet: row of share targets (Copy link, Message, Repost, Save video, Duet, Stitch) with icons; Copy link shows a toast.
6. Tapping the creator avatar or name opens their profile: avatar, @handle, Following / Followers / Likes counts, Follow + Message buttons, bio, tabs (videos, liked), 3-column grid of video thumbnails with play-count overlays; tapping a thumbnail opens that video in the feed pager.
7. Create (center button): a mock camera screen (no camera permission: an animated gradient backdrop) with a 15s/60s/Photo selector, effects and filters side buttons, a big record button that animates a progress ring for 3 s while "recording", then a post screen with caption and "Post" that adds it to your profile with a toast.
8. Friends: list of friends' latest videos. Inbox: activity (likes, new followers, mentions) and messages list with a chat thread. Profile (@ansh.clips): your own profile with Edit profile and a grid.

Rules for the whole app:
- Native SwiftUI for iOS 26, the deployment target the Vibecode iOS template already uses (do not change it). iPhone-first layout. SF Symbols are fine for UI icons (never for the TikTok logo or any brand mark).
- Everything runs on-device from realistic, deterministic fixture data in one Swift file (e.g. Fixtures.swift: real-sounding names, handles, numbers, timestamps, captions). No backend (leave the backend/ folder alone and make no network calls except loading images and media), no login, no permissions (no camera, photos, location, contacts, notifications, microphone). Do not persist state (no UserDefaults, @AppStorage, SwiftData or files): every launch starts from the same fixture state, so the demo is repeatable.
- Remote images: load images.unsplash.com photo URLs (with ?w=800&q=80 style params) with AsyncImage (or a small cached image view) and a tasteful placeholder. Verify every image and media URL with `curl -s -o /dev/null -w "%{http_code}" <url>` before you use it and replace any that do not return 200. No broken or blank images anywhere.
- Polish: native-feeling spacing and typography, safe areas, smooth spring animations (.spring/.snappy, most under 350 ms), matchedGeometryEffect for hero and expand/collapse transitions where it helps, .sensoryFeedback haptics on key taps, pressed states, and loading/empty states. Simulated waits stay short (under 3 s). Every button visible on screen does something sensible; nothing is a dead end.
- Keep the compiler happy: small files (under ~300 lines each), big view bodies split into subviews, and no long chained expressions, so nothing hits "unable to type-check this expression in reasonable time".
- It must build with zero errors and run in the iOS simulator with no crash. Walk through every flow above and fix anything broken.