feat: cache SVG previews in File Explorer#48223
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niels9001
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Caches SVG preview output in File Explorer so the same SVG does not need to be regenerated every time a folder is opened.
What changed
Add deterministic cache helper to avoid per-preview temp files.
Reuse cached HTML in the SVG preview handler and SVG thumbnail provider instead of regenerating on every request.
Add unit tests to validate cache-key stability.
Validation
Static checks: no syntax errors reported for the modified files.
Local limitation: the .NET SDK (dotnet) is not available in this environment, so full dotnet test/CI couldn't be run locally. GitHub Actions will run CI on the PR.
PR Checklist
Communication: I have commented on the issue and requested to be assigned / noted my intent to work on it.
Closes #48197
Tests: added unit tests for cache-key behavior
CI: relies on GitHub Actions to run full build/tests
Docs/Localization: not applicable for this change