Academia - For Campus Students

Fixes and improvements in this release: - Fix feed images silently failing to load and getting stuck on a broken-image state after scrolling past and back to them - Fix comment composer being covered by the on-screen keyboard on the post detail screen - Fix a crash when sharing a post from its detail screen (RenderBox cast failure from the app bar's sliver context) - Fix URLs in post/comment text picking up trailing punctuation (closing parens, sentence periods, quotes) into the link itself - Fix banner ads reloading on every feed list rebuild - Redesign the post detail screen with Material 3 expressive styling and break it into dedicated composer/app-bar/header/action-row widgets, also adopted by the feed's post card - Redesign the video trimmer screen's UI and save flow - Replace Lottie animations with static icon assets in several chirp empty/error states - Add a skeletonizer-based placeholder for the comment section's loading states - Add muted-autoplay preference and video/image attachment support for chirp feed media - Hide the comment upvote/downvote control until it's wired up on the backend