style: 优化按钮间距样式 #16

Job	Run time
build (ubuntu-latest, linux, npm run dist:linux, release-linux, release/.AppImage release/.deb )	3m 13s
build (macos-latest, mac, npm run dist:mac, release-macos, release/*.dmg )	2m 43s
build (windows-latest, win, npm run dist:win, release-windows, release/.exe release/.zip )	4m 8s
release	1m 4s
	11m 8s

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