feat: enhance homepage styles with new hero grid, widgets, and showca… #9

Job	Run time
Tauri build smoke test	3m 53s
Rust check & test	1m 37s
Frontend lint, typecheck & unit tests	27s
Offline critical journey tests	1m 14s
1.x → 2.0 migration rehearsal	1m 20s
	8m 31s

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