fix(web): widen the credential type select so options are not clipped

The credential dialog used a w-fit trigger, so the popup inherited the width
of the currently selected label ("Access token"), and the explicit min-w-0
on the popup removed the 9rem floor that select-content normally keeps. The
longest option, "Username and password", was therefore clipped by the
popup's overflow-x-hidden.

Let the trigger span the dialog and keep the default min width of the popup.

Verification:
- cd web && npx tsc --noEmit
- cd web && npx oxlint
- cd web && npx vite build

web/src/components/CredentialDialog/index.tsx

@@ -147,10 +147,10 @@ export default function ({
                 if (v) setType(v);
               }}
             >
-              <SelectTrigger>
+              <SelectTrigger className="w-full">
                 <SelectValue />
               </SelectTrigger>
-              <SelectContent className="min-w-0">
+              <SelectContent>
                 {credentialTypes.map((item) => (
                   <SelectItem key={item.value} value={item.value}>
                     {t(item.labelKey)}