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fix(ui): align page headers and action cards with the design system #6304

Job	Run time
Build Impact	17s
Shell Deploy Scripts	18s
CLI Tests (macos-15)	12m 56s
Frontend Build	7m 30s
CLI Tests (windows-latest)	11m 2s
Rust Build Check (macos-15)	14m 7s
CLI Tests (ubuntu-latest)	8m 13s
Rust Build Check (windows-latest)	23m 53s
Rust Build Check (ubuntu-latest)	14m 51s
DSH Profile Packaging (windows-latest)	0s
Impact-selected Linux / Relay Contract	0s
Rust / CLI Validation	5s
	1h 33m 12s