[kjmikkel]

Closes #37.

Change

• AutosaveRecovery:
  • Fallback location: %LOCALAPPDATA%\PillarsDialogEditor\autosave\<file name>.<16-hex hash of the full path>.autosave, plus generations. The hash ignores path casing, and two projects with the same file name don't collide.
  • IsLocationFailure decides when to fall back: UnauthorizedAccessException, DirectoryNotFoundException, or a write-protected volume (0x80070013). A sharing violation doesn't count, since that's a passing moment rather than the location.
  • Check looks next to the project and in the fallback folder, and returns the newer copy (IsFallback says which).
  • TryDelete sweeps every generation in both places, so central copies don't pile up.
• MainWindowViewModel.AutosaveTick:
  • Tries next to the project first, every tick, so a folder that becomes writable again is used again.
  • On a location failure it writes the fallback copy instead.
  • It says so once per project in the status bar, without a dialog.
• Restore offer: the seam now passes the fallback folder (null for a copy next to the project), and the dialog adds a sentence saying the copy was kept in the editor's own folder.
• Strings: Status_AutosaveFallback and AutosaveRestore_FromFallback, in Strings.axaml.

Tests

• AutosaveFallbackTests (16 cases): the path, keying, casing, generations, Check choosing the newer copy, a stale fallback copy, deletion sweeping both places, rotation, and the exception classification.
• MainWindowViewModelAutosaveTests:
  • an unwritable project folder writes the fallback copy, and the status is shown once, not on every tick;
  • a newer fallback copy is offered with its folder and restored;
  • a local copy is offered without a folder.
• The unwritable folder is simulated by a directory sitting where the sidecar file should go, which gives UnauthorizedAccessException; the serializer creates missing folders, so a missing folder doesn't work. With the fallback disabled, both tick tests fail.
• Full headless suite: 4165 passed, 0 failed, 17 skipped.

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