refactor(forms): port game form to Chakra v3 with v4-style selects
- New FixedSelect wrapper over chakra-react-select v6 restoring the v4
look everywhere: single gray.500 control border, flush addon chevron
zone with rounded inner corners, hidden indicator separator, v4 option
padding/type scale, gray subtle pills, brighter unselected hover
- GameForm: FormControl/InputGroup -> Field/Flex, Button
colorScheme/isLoading -> colorPalette/loading, Stack spacing -> gap,
Container container.md -> 768px, Steam Scrape row rebuilt as nowrap
Flex, select wrappers de-bordered (control owns the border)
- formFields: Field/Checkbox/Switch shims in, required asterisk dropped
to match legacy labels, Select/Creatable wrappers de-bordered,
TS-typed select callbacks