feat: export fingerprint image as PNG - #17
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Adds a "File → Export Fingerprint as PNG..." command (Ctrl+Shift+E) that saves the currently-displayed fingerprint to a PNG via a save dialog. - IFileDialogService/FileDialogService: add ShowSaveFileDialogAsync mirroring the existing open-dialog pattern (Avalonia SaveFilePickerAsync). - MainWindowViewModel: ExportPngCommand gated on an image being decoded (CanExportPng; re-evaluated via NotifyCanExecuteChangedFor when the bitmap changes). Saves the already-decoded WriteableBitmap with Bitmap.Save (Skia PNG encode — no native deps, cross-platform). - MainWindow.axaml: File-menu item; auto-disables when no image is shown. - README/project_context: check off PNG export; fix stale .NET 8 -> .NET 10 references in project_context. Note: export lives in the Avalonia UI layer (the project has no headless UI test harness), so this is covered by cross-platform compile + the existing Core suite in CI; the save/render path itself needs a manual smoke-test. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
- CanExportPng also requires !IsDecodingImage (and _isDecodingImage notifies the command) so the menu disables while a decode is in flight. - ShowSaveFileDialogAsync sets FilePickerSaveOptions.DefaultExtension (derived from the first *.ext filter) so bare filenames get .png on Linux/macOS. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds File → Export Fingerprint as PNG... (
Ctrl+Shift+E) — saves the currently-displayed fingerprint image to a.pngvia a save dialog.How
WriteableBitmapfor display. Export reuses it:bitmap.Save(path)(Skia PNG encode — managed, cross-platform, no native deps).IFileDialogService/FileDialogServicegainShowSaveFileDialogAsync, mirroring the existing open-dialog pattern (SaveFilePickerAsync).ExportPngCommandis gated on an image being present (CanExportPng, re-evaluated via[NotifyCanExecuteChangedFor]); the menu item auto-disables otherwise.Folded in
project_context.md: fixed stale.NET 8→.NET 10(leftover from the chore: bump to .NET 10 (LTS) #14 bump).Verification & honest gap
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