[RSM] Smart bookmarks bottom sheet

[sztomek]

Description

This PR is the last piece of the puzzle as we can now display all the bookmark details on a dedicated bottom sheet.

Testing Instructions

Since the server changes are not deployed yet, please refer to #5284 for test instructions

Screenshots or Screencast

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[Copilot]

Pull request overview

This PR adds a dedicated “Bookmark details” bottom sheet so users can tap a bookmark row (when not multi-selecting) to view its full details (title, episode title, timestamp, AI summary, created-at) and play/pause from that sheet.

Changes:

• Updated bookmark row tap handling to open a bookmark detail flow when multi-select is not active.
• Wired a new navigation event from BookmarksViewModel → BookmarksPage → BookmarksFragment to present BookmarkDetailFragment.
• Added a new Compose UI (BookmarkDetailPage) and dialog fragment (BookmarkDetailFragment) for the bottom sheet content.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
modules/features/player/src/main/java/au/com/shiftyjelly/pocketcasts/player/viewmodel/BookmarksViewModel.kt	Emits a new showBookmarkDetail event on row tap when not multi-selecting.
modules/features/player/src/main/java/au/com/shiftyjelly/pocketcasts/player/view/bookmark/BookmarksPage.kt	Collects the new event and forwards it to a UI callback with episode title context.
modules/features/player/src/main/java/au/com/shiftyjelly/pocketcasts/player/view/bookmark/BookmarksFragment.kt	Shows BookmarkDetailFragment when the detail-click callback fires.
modules/features/player/src/main/java/au/com/shiftyjelly/pocketcasts/player/view/bookmark/BookmarkDetailPage.kt	New Compose UI rendering bookmark detail content and playback controls.
modules/features/player/src/main/java/au/com/shiftyjelly/pocketcasts/player/view/bookmark/BookmarkDetailFragment.kt	New dialog fragment hosting the detail page in a bottom-sheet style dialog.

[wpmobilebot]

Version 8.12 has now entered code-freeze, so the milestone of this PR has been updated to 8.13.