This is the big one.
TLDR:
The Library screen has been redesigned.
Material 3 Expressive components are now used through out all screens except the reader.
New themes have been added, old ones have been tweaked or removed entirely.
New more playful font.

• feat: Migrate Library Screen to Compose (#2354)
• feat: Use wavy progress indicator instead of circle for swipe refresh
• feat:library updating now pulsates the library button
• feat: Add a method to easily preview a composable with all colorSchemes (#2363) (@google-labs-jules[bot])
• feat: Add display option sheet for browse, similar, display screens
• feat: Add event flows to LibraryUpdateJob (#2362) (@google-labs-jules[bot])
• feat: Add monochrome theme
• feat: Add Nord theme
• feat: Add/tweak xml themes to match the new themes and existing themes (#2361)
• feat: browse home page header color, and grid manga title text size
• feat: chocolateStrawberries -> chocolate theme and material 3 expressive
• feat: New more rounded font
• feat: Remove Sapphire dusk and replace with dark variation of teal ocean
• feat: slight tweak for OrangeColorScheme.kt
• feat: spring blossom replaces midnight dusk
• feat: tweak feed screen to be expressive lists
• feat: Update BlueGreenColorScheme.kt for M3 Expressive
• feat: update neko light theme
• feat: update NekoColorScheme.kt for material 3 expressive
• feat: update PinkColorScheme.kt for material 3 expressive
• feat: Update PurpleColorScheme for M3 Expressive
• feat: update the display, browse, similar lists to be expressive design
• feat: upgdate outrun theme to retro and make it material 3 expressive
• fix: add missing colors for tako theme
• fix: add on completion to mangascreen
• fix: adjust start reading and unread badge colors
• fix: adjust the start reading button color
• fix: catch the manga coordinator channel error
• fix: category header refresh not starting correctly
• fix: change download card color
• fix: change letter spacing
• fix: change letterspacing globally instead of per text composable
• fix: change text for display option
• fix: change wording for fiter
• fix: click area for has available chapters in filter sheet
• fix: compile issue
• fix: crash screen not being padded at bottom
• fix: crash screen status bar color
• fix: dont use sticky headers for similar grid view
• fix: dropdown box not aligned correctly for some overflow menus
• fix: final theme tweaks
• fix: fix oom for category update by using flow, remove unneeded is running flow
• fix: font size on homepage
• fix: horizontal category tab text color when selected
• fix: issue where group map was null and causing some manga not to load their details page
• fix: jungle dark navigation bar colors
• fix: long press manga
• fix: mangascreen button block outline colors
• fix: missed some font references
• fix: missing incognitio icons for some screens
• fix: nav bar not hiding when switching screens after cleanup of files
• fix: new install reader navigation overlay crash
• fix: only show loading for history/updates on first page
• fix: potential memory leak in webview
• fix: remove ViewTargets for Covers and Library
• fix: right arrow messed on missing chapters estimate, chip sizes on tags and alt titles, and chapter filter label size
• fix: ripple color in reader sheet and hide "en" chapter
• fix: set the rate limit to 5 requests per second vs 300 in a minute. (#2365) (@google-labs-jules[bot])
• fix: split reader setting in downloads had a typo
• fix: Tropical renamed to Jungle
• fix: tweak crayon theme
• fix: tweak crayon theme
• fix: tweak dark blue theme
• fix: tweak jungle theme
• fix: tweak neko theme to kitsune and match app icons
• fix: tweak orange juice theme aka citrus squeeze
• fix: tweak retro theme -> miami vice
• fix: tweak royal theme
• fix: tweak spring blossom aka cherry blossom
• fix: tweak tako
• fix: tweak teal theme and change bottom nav active color
• fix: typo in loading summary values
• fix: un-condense letters a tad
• fix: update browse screen for Index Replacement
• fix: update display screen for Index Replacement
• fix: update jungle theme to be more jungle
• fix: update library screen for Index Replacement
• fix: update manga object with user cover when reader sets a chapter image as cover
• fix: update manga screen for Index Replacement
• fix: use material 3 container loading indicator on browse screen
• fix: Use persistent lists instead of immutable lists
• fix: whats new changelog sheet crashing app
• Add Crayon Blue theme
• chore: bump app version
• chore: code format
• chore: remove flexible adapter
• chore: remove thumb_drawable.xml
• chore: update dependency io.mockk:mockk to v1.14.6 (#2358) (@renovate[bot])
• opt: Optimize browse screens (#2350) (@google-labs-jules[bot])
• opt: feed presenter download marking
• ref: add expressive shapes to manga details screen and adjust the default shape
• ref: adjust dropdown menu some more to have manga detail dropdowns to be themed with button colors
• ref: browse filter screen to use wavy progress indicator
• ref: change display screen to use wavy progress indicator
• ref: clean up some commented out code
• ref: downlaod screen to use wave progress indicator
• ref: download button (#2367)
• ref: footer buttons in feed and browse to be connected expressive buttons (#2371)
• ref: intial pass to remove unused resources, classes, functions
• ref: Make dropdown menu more consistent
• ref: manga details header (#2368)
• ref: MangaDetailPresenter State Management (#2346) (@google-labs-jules[bot])
• ref: move try to setForeground earlier in App Downloader
• ref: move vertical library categories outside of librarypage (#2366) (@google-labs-jules[bot])
• ref: Neko Scaffold Title Bar to use the Flexible Top Bar and fix the under notification drawing
• ref: switch browse sheet top buttons to connected buttons
• ref: switch manga screen to used flexible top bar and show incognito icon
• ref: switch the rest of top bars to use Flexible Top Bar Adapter
• ref: tweak feed page headers
• ref: use custom ExpressivePicker and remove some unused libraries
• ref: use expressive shapes for quick read chapter button in manga details
• ref: Use mangaId instead of category id to update the category headers in library (#2364)
• ref: use material 3 loading
• ref: use material 3 pull to refresh library