feat: file-based keychain fallback for headless Linux/WSL #350

Job	Run time
rust-check	2m 51s
ts-check	2m 57s
rust-test (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 9s
rust-test (windows-latest, x86_64-pc-windows-msvc)	4m 35s
rust-test (macos-latest, aarch64-apple-darwin)	2m 57s
coverage-report	8s
e2e-web	2m 9s
e2e-desktop / e2e-desktop (windows-latest)	23m 23s
e2e-desktop / e2e-desktop (ubuntu-latest)	17m 12s
build	17m 33s
test-report	8s
e2e-desktop / e2e-report	11s
	1h 17m 13s

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