feature(PhotoViewer): Keep screen alive during slideshow

[PartyDonut]

Pull Request Description

Keep screen alive during slideshow
Added full-screen toggle

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds functionality to keep the screen on during slideshows using Wakelock and introduces a full-screen toggle button for desktop platforms in the photo viewer.

Sequence diagram for slideshow timer lifecycle

sequenceDiagram
  participant User
  participant RestartableTimerController
  participant WakelockPlus

  User->>RestartableTimerController: Starts slideshow
  activate RestartableTimerController
  RestartableTimerController->>WakelockPlus: enable()
  activate WakelockPlus
  WakelockPlus-->>RestartableTimerController: (Screen stays on)
  deactivate WakelockPlus
  RestartableTimerController->>RestartableTimerController: Starts timer
  RestartableTimerController-->>User: Slideshow progresses

  User->>RestartableTimerController: Stops slideshow
  RestartableTimerController->>WakelockPlus: disable()
  activate WakelockPlus
  WakelockPlus-->>RestartableTimerController: (Screen can turn off)
  deactivate WakelockPlus
  RestartableTimerController->>RestartableTimerController: Cancels timer
  deactivate RestartableTimerController

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File-Level Changes

Change	Details	Files
Implemented wakelock to keep the screen on during slideshows, preventing the device from sleeping.	Added the wakelock_plus package as a dependency. Enabled wakelock when the slideshow timer starts. Disabled wakelock when the slideshow timer is cancelled or disposed.	lib/widgets/shared/progress_floating_button.dart
Added a full-screen toggle button for desktop platforms in the photo viewer controls.	Added a FullScreenButton widget that is conditionally rendered based on the platform. Imported full_screen_button.dart or full_screen_button_web.dart based on the platform. Added closeFullScreen() to the dispose method.	lib/screens/photo_viewer/photo_viewer_controls.dart

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[sourcery-ai]

Hey @PartyDonut - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment explaining why WakelockPlus.disable() is called in multiple places.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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