fix(web): adapt caption buttons to Windows styling #6070

Job	Run time
Build Impact	22s
Shell Deploy Scripts	11s
Frontend Build	7m 39s
Rust / CLI Validation	8s
Impact-selected Linux / Relay Contract	-1s
CLI Tests (${{ matrix.os }})	-1s
Rust Build Check (${{ matrix.os }})	-1s
DSH Profile Packaging (windows-latest)	-1s
	8m 16s

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