Provider SVGs in providers.js declare only viewBox (no width/height),
so when injected into the 18×18 logo chips they fell back to the
browser default of 300×150 and blew out the row.
- CSS: SVGs inside settings logo chips (`span[id$="-logo"]`,
the 18px wrappers in fallback rows) now stretch to 100%/100% of
their container.
- Added matching `-logo` chip next to the Endpoint dropdowns in
Default Chat Model and Utility Model cards.
- New `_syncEndpointLogo` helper mirrors the selected endpoint
option's text label through providerLogo() (the select value is
a UUID and wouldn't match anything otherwise), and
`_fillEndpointSelect` calls it on each render.
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