feat: Add showcase and ecosystem links to documentation and enhance f… #10

Job	Run time
Frontend lint, typecheck & unit tests	27s
Rust check & test	2m 33s
Tauri build smoke test	3m 45s
1.x → 2.0 migration rehearsal	1m 5s
Offline critical journey tests	1m 18s
	9m 8s

Provide feedback