feat(tests): add unit tests for format utility functions and configur… #3

Job	Run time
Tauri build smoke test	3m 43s
Rust check & test	1m 29s
Frontend lint, typecheck & unit tests	22s
1.x → 2.0 migration rehearsal	1m 14s
Offline critical journey tests	3m 21s
	10m 9s

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