[UI/UX Fix] Address several issues within PostDetailsPage screen

[RyanCheung555]

Overview

• Changed PostDetailPage.kt to better reflect intended user experience as per IOS release version/Figma guidelines

Changes Made

• User can now scroll the content within the bottom sheet for longer descriptions
• Bottomsheet starts in a less expanded position and any empty space is covered by the image expanding to fit the emptiness
• Bookmark FAB is now in the bottom right corner with less vertical bottom padding. It is also tied to the bottomsheet top instead of the text

Test Coverage

Tested on Medium Phone with multiple different kinds of posts.

Screenshots (delete if not applicable)

Post Detail Demo (long-ish description)

PostDetailDemo.webm

Summary by CodeRabbit

• Improvements
  • Product detail pages now use a partially expanded, draggable bottom sheet.
  • Content remains vertically scrollable within a maximum height.
  • Product images resize and reposition smoothly as the sheet is dragged.
  • Images now use crop scaling for a more consistent presentation.
  • Bookmark controls are positioned at the bottom of the image area.
  • Additional bottom spacing accommodates navigation bars and the optional contact button.

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📝 Walkthrough

Walkthrough

The PDP now uses a partially expanded bottom sheet with live offset tracking. The image and overlays adjust during dragging. Sheet content is scrollable, constrained by maximum height, and includes navigation-bar and contact-button clearance.

Changes

PDP bottom-sheet layout

Layer / File(s)	Summary
Dynamic sheet sizing app/src/main/java/com/cornellappdev/resell/android/ui/screens/pdp/PostDetailPage.kt	The PDP replaces fixed image-height and sheet-height measurements with a partially expanded sheet. Image sizing derives from the live sheet offset.
Image and overlay positioning app/src/main/java/com/cornellappdev/resell/android/ui/screens/pdp/PostDetailPage.kt	The image, pager, and bookmark use sheet-relative positioning. The bookmark aligns to the bottom end. The foreground image uses Crop scaling.
Scrollable content clearance app/src/main/java/com/cornellappdev/resell/android/ui/screens/pdp/PostDetailPage.kt	Sheet content uses a maximum height and vertical scrolling. Bottom clearance includes navigation-bar insets and optional contact-button spacing.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to cc852

On very compact windows, opening a post detail page can fail to lay out its image before the sheet is positioned. Clamp the fallback image height to keep the page usable on those devices.

Sequence Diagram(s)

sequenceDiagram
  participant PostDetailPage
  participant BottomSheetScaffold
  participant PDPImage
  participant SheetContent
  PostDetailPage->>BottomSheetScaffold: configure partially expanded sheet
  BottomSheetScaffold-->>PostDetailPage: expose live sheet top offset
  PostDetailPage->>PDPImage: apply offset-derived image height
  PostDetailPage->>SheetContent: apply sheet-relative overlay padding
  SheetContent->>SheetContent: scroll within maximum height

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the UI/UX fixes in the PostDetailsPage screen and matches the primary changes.
Description check	✅ Passed	The description includes an overview, implementation details, test coverage, and a demonstration video. The omitted optional sections do not prevent review.

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• Commit unit tests in branch ryan/ui-improvements

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Actionable comments posted: 1

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Inline comments:
In
`@app/src/main/java/com/cornellappdev/resell/android/ui/screens/pdp/PostDetailPage.kt`:
- Line 141: Clamp the fallback height calculation in the PostDetailPage
implementation so peekedImageHeight never falls below 0.dp before it flows
through liveImageHeight to the image Modifier.height calls; preserve the
existing screenHeight-minus-peekHeight behavior for non-negative results.

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ℹ️ Review info

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between b619f04 and cc852aa.

📒 Files selected for processing (1)

• app/src/main/java/com/cornellappdev/resell/android/ui/screens/pdp/PostDetailPage.kt

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[caleb-bit]

Thanks so much for working on this. (I had a PR on the bookmark icon back in the day using some weird hack; not sure where that PR went). The code does leave me with a lot of questions, especially the hard-coded values (e.g., 46.dp + 52.dp + 24.dp). The existing comments are informative but still not too clear.

Do we know if all the hardcoding is necessary? And if so, you should define constants for semantic clarity. For instance, the 24.dp is probably good to extract.

We can discsus further during work sesh, but overall there should be more documented justification if we're using more "hacky" solutions.