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fix(ui): align page headers and action cards with the design system #6306

Job	Run time
Build Impact	20s
Shell Deploy Scripts	12s
Frontend Build	10m 13s
CLI Tests (macos-15)	11m 41s
Rust Build Check (macos-15)	21m 3s
Rust Build Check (ubuntu-latest)	16m 29s
Rust Build Check (windows-latest)	28m 15s
CLI Tests (windows-latest)	14m 37s
CLI Tests (ubuntu-latest)	12m 32s
DSH Profile Packaging (windows-latest)	0s
Impact-selected Linux / Relay Contract	0s
Rust / CLI Validation	3s
	1h 55m 25s