fix: Shuffle play videos

[PartyDonut]

Pull Request Description

Apply shuffle to photo/video libraries
Fix non-video files being added to playback list when playing videos

Issue Being Fixed

Resolves #322

[sourcery-ai]

Hey @PartyDonut - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

issue (bug_risk): indexOfSelected not recalculated for shuffled items

Compute indexOfSelected on shuffled items when shuffle is true to avoid opening the wrong photo.

[sourcery-ai]

Reviewer's Guide

This PR enhances the library playback flow by restricting to playable video items, propagating the shuffle flag to playback APIs, and applying shuffle to the photo viewer list when shuffle mode is enabled.

File-Level Changes

Change	Details	Files
Filter out non-playable media items before initiating video playback	Inserted a filter to only include types recognised as playable Ensured itemsToPlay list excludes non-video files	lib/providers/library_search_provider.dart
Propagate shuffle option to the video playback routine	Added shuffle parameter to playLibraryItems invocation Removed hardcoded playback order in favor of shuffle-aware logic	lib/providers/library_search_provider.dart
Apply shuffle to the photo viewer’s item list when requested	Wrap allItems with .shuffled() if shuffle flag is true Maintain original order when shuffle is disabled	lib/providers/library_search_provider.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#322	The shuffle button should shuffle the selected items.	✅
#322	The shuffle button should play the shuffled items.	✅
#322	When playing videos, only video files should be added to the playback list.	✅

Possibly linked issues

• 🐛 Shuffle is broken #322: The PR implements the missing shuffle logic to fix the broken shuffle function reported in the issue.

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