Fix URI path handling for encoded characters

[yuto-trd]

Description

Unescape URI paths in various components to correctly handle encoded characters.

Breaking changes

No breaking changes introduced.

Fixed issues

No specific issues fixed.

[github-actions]

No TODO comments were found.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Beutl.Operators	4%	0%	76	➖
Beutl.Core	34%	31%	3142	➖
Beutl.Engine	27%	24%	9789	➖
Beutl.Threading	99%	90%	118	✔
Beutl.Utilities	73%	67%	358	➖
Beutl.Configuration	38%	19%	282	➖
Beutl.Extensibility	2%	0%	105	➖
Beutl.ProjectSystem	16%	10%	1852	➖
Beutl.Language	0%	0%	656	➖
Summary	27% (10550 / 39053)	25% (2804 / 11039)	16378	➖

Minimum allowed line rate is 0%

[Copilot]

Pull request overview

This PR systematically adds Uri.UnescapeDataString() calls throughout the codebase to properly handle URI-encoded characters in file paths. This ensures that files with special characters (spaces, Unicode characters, etc.) in their names can be accessed correctly when their paths are stored as URIs.

Key Changes

• Applied Uri.UnescapeDataString() to all Uri.LocalPath accesses before file system operations across 26 files
• Refactored editor ViewModels (Video/Sound/ImageSourceEditorViewModel) to chain reactive property transformations properly
• Updated serialization code to unescape paths when writing to or reading from disk

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
PlayerView.axaml.MouseControl.cs	Unescape URI path when extracting filename for image export
PlayerView.axaml.FrameContextMenu.cs	Unescape URI path when extracting filename for image export
MainView.axaml.InitializeMenuBar.cs	Unescape URI path for element deletion operations
SourceOperatorsTabViewModel.cs	Unescape URI paths for view state file operations
OutputViewModel.cs	Unescape URI path when determining default output location
OutputTabViewModel.cs	Unescape URI path when adding output items
TimelineViewModel.cs	Unescape URI path when pasting image elements
NodeTreeTabViewModel.cs	Unescape URI paths for state persistence and element matching
MainViewModel.cs	Unescape URI path for project name display
VideoSourceEditorViewModel.cs	Chain unescaping through reactive properties for file info
SoundSourceEditorViewModel.cs	Chain unescaping through reactive properties for file info
ImageSourceEditorViewModel.cs	Chain unescaping through reactive properties for file info
EditViewModel.cs	Unescape URI paths for view state file operations
CreateNewSceneViewModel.cs	Unescape URI path when determining initial location
ProjectService.cs	Unescape URI path for recent projects tracking
OutputService.cs	Unescape URI paths for profile serialization and file path storage
EditorService.cs	Unescape URI paths for file operations and tab management (includes minor formatting changes)
RandomFileNameGenerator.cs	Unescape base directory URI path for random filename generation
Scene.cs	Unescape URI paths for file synchronization and element management (contains a bug at line 352)
VideoSource.cs	Unescape URI path before opening media reader
SoundSource.cs	Unescape URI path before opening media reader
JsonSerializationContext.Serialize.cs	Unescape URI path when creating file streams
CoreSerializer.cs	Unescape URI path when storing objects to disk
CoreSerializableJsonConverter.cs	Unescape URI path when creating file streams
UriHelper.cs	Unescape URI paths for byte array and stream resolution

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[Copilot]

Missing Path.GetDirectoryName() call. The dirPath variable should contain a directory path, but this code is assigning the full file path instead. This should be:

string dirPath = Path.GetDirectoryName(Uri.UnescapeDataString(Uri!.LocalPath))!;

This bug will cause incorrect path comparisons with Path.GetRelativePath() at lines 359 and 375, leading to wrong behavior when managing element inclusion/exclusion.

Suggested change

	string dirPath = Uri.UnescapeDataString(Uri!.LocalPath);
	string dirPath = Path.GetDirectoryName(Uri.UnescapeDataString(Uri!.LocalPath))!;