fix(s3): honest per-source versioning across backends and multipart-upload leak sweep #949

Job	Run time
rustfmt	9s
ui build + lint + unit	1m 19s
cargo deny	49s
tauri compile (macos-latest)	2m 39s
tauri compile (windows-latest)	5m 13s
cargo test + clippy (ubuntu-latest)	7m 45s
cargo test + clippy (macos-latest)	9m 5s
cargo test + clippy (windows-latest)	23m 1s
tauri compile (ubuntu-latest)	2m 59s
	52m 59s

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