DISC-138: VideoFeed ViewModel

[Arkariang]

📲 What

Implements the Video Feed query and navigation interactions. This includes a scrollable vertical video powered by a real GraphQL query adding pagination, bookmark/watch toggling with optimistic UI and animation interaction and login gated, project navigation for back this project button, and a Compose-native error snackbar.

🤔 Why

This PR focuses on core interactions — watching/unwatching projects, navigating to project pages, and paginating through the feed — while deferring share(follow up ticket) and more-options actions to a future phase.

🛠 How

GraphQL

• Added VideoFeed query in project.graphql with cursor-based pagination and badge support.
• Extracted a videoFeedProject fragment in fragments.graphql to encapsulate the minimal project fields needed for the feed (including isWatched, watchesCount, sharesCount, and verticalVideo for HLS playback).

ViewModel (VideoFeedViewModel)

• Replaced the hardcoded demo project list with a real paginated getVideoFeed Apollo call.
• Added cursor tracking (nextPage, hasMore)
• bookmarkProject(project, index) emits an optimistic state immediately on tap (icon flips without waiting for the network), then reverts on API failure.
• Exposed isUserLoggedIn state to gate bookmark actions behind authentication.
• provideErrorAction now wired inside the Compose setContent block via setUpVideoFeedErrorActions.

UI (VideoFeedScreen / VideoFeedActivity)

• VideoFeedScreen now accepts VideoFeedItem list (badges + project + HLS URL) instead of raw Project list.
• onLoadMore triggers when the current page is within 3 items of the end (items.size - 3 threshold).
• SnackbarHost placed as the last child in the root Box so it renders above the pager.
• VideoFeedActivity uses registerForActivityResult to re-execute a pending bookmark after a successful login redirect.
• Project tap routes to startProjectActivity or startPreLaunchProjectActivity depending on prelaunch state; profile tap routes to startCreatorBioWebViewActivity.

Bookmark animation (KSVideoActionsColumn)

• Animation fires instantly on tap and assumes optimistic state emission, will revert back in case of network failure.
• More-options button hidden for Phase 1 via alpha(0f) + enabled = false (preserves layout space).

Data / Transformers

• VideoFeedTransformers.kt maps VideoFeedQuery.VideoFeed → VideoFeedEnvelope, decodes relay IDs, maps badges, maps isWatched → isStarred, reads HLS URL from verticalVideo.
• Added IntExt.toCompactFormat() for compact number display (e.g. 1200 → "1.2k").

Tests

• VideoFeedViewModelTest: pagination, optimistic bookmark update, revert on failure, login-gate.
• VideoFeedTransformersTest: all badge types, field mapping, null handling, isWatched → isStarred.
• VideoFeedScreenTest: load-more threshold, snackbar, bookmark index, empty state. Uses hasAnyAncestor scoping to handle beyondViewportPageCount = 1 pre-composing neighbor pages.
• KSVideoActionsColumnTest: bookmark content description for both states

👀 See

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📋 QA

• Scroll through the pager — confirm new items load automatically near the end of the list. ⚠️ cannot be tested just yet on staging not enough projects, will carry to QA ticket.
• Tap the bookmark icon on a project you have not bookmarked — confirm the icon fills immediately, count increments.
• Tap again to unbookmark — confirm it reverts immediately.
• Log out and tap bookmark — confirm the login screen appears. After logging in, confirm the bookmark is applied.
• After bookmarking, leave the screen or kill the app and come back to VideoFeed, confirm the filled bookmark icon appears on first render without any tap.
• Tap the project card button — confirm navigation to the correct project page (or pre-launch page for pre-launch projects).
• Tap the creator avatar — confirm navigation to the creator bio web view.
• Simulate a network error during bookmark (e.g. airplane mode) — confirm the snackbar appears

Story 📖

DISC-138

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 80.23256% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.37%. Comparing base (6ad3937) to head (1028b01).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...features/videofeed/viewmodel/VideoFeedViewModel.kt	60.78%	6 Missing and 14 partials ⚠️
...s/transformers/extensions/VideoFeedTransformers.kt	78.43%	0 Missing and 11 partials ⚠️
...pp/src/main/java/com/kickstarter/models/Project.kt	71.42%	0 Missing and 2 partials ⚠️
...es/videofeed/ui/components/KSVideoActionsColumn.kt	95.23%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2505      +/-   ##
============================================
+ Coverage     64.18%   64.37%   +0.18%     
- Complexity     2438     2443       +5     
============================================
  Files           392      393       +1     
  Lines         30077    30220     +143     
  Branches       4355     4395      +40     
============================================
+ Hits          19306    19455     +149     
+ Misses         8432     8398      -34     
- Partials       2339     2367      +28     

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[Arkariang]

Can potentially add a new VerticalVideo class within Project model, and remove this parameter from the VideoFeedItem, but alas this level of abstraction seems correct to me to stop making Project objects so bloated