fix(combobox): stop a single chip wrapping the chevron to a second line

The field's input carried min-w-16 (64px). Flex line-packing sizes a flex item
at its min-width, so in a narrow rail field (~202px) one chip (~119px) + the
64px-reserved input + the chevron overflowed the line, wrapping the chevron
down while the (grown, empty-looking) input filled the first line — the "breaks
to two rows even though it'd fit" glitch seen on the Plex Collection widget and
the feed's channel picker (both are Combobox). Lowering the floor to min-w-8
(32px) keeps chip + input + chevron on one line; flex-1 still grows the input to
fill the remaining width. Verified in-browser: field height 54px→36px (one row).

frontend/src/components/Combobox.tsx

@@ -220,7 +220,11 @@ export default function Combobox({
               ? (placeholder ?? t("common.search", { defaultValue: "Search" }))
               : ""
           }
-          className="min-w-16 flex-1 bg-transparent px-1 py-0.5 text-sm outline-hidden placeholder:text-muted/60"
+          // min-w-8 (not -16): flex line-packing sizes the input at its MIN-width, so a wide 64px floor
+          // made a single chip + the reserved input + the chevron overflow a narrow rail field — wrapping
+          // the chevron to a second line while the (empty) input filled the first. A small floor keeps the
+          // chip + input + chevron on one line; flex-1 still grows the input to fill whatever room is left.
+          className="min-w-8 flex-1 bg-transparent px-1 py-0.5 text-sm outline-hidden placeholder:text-muted/60"
         />
         <ChevronDown className="pointer-events-none mr-0.5 h-3.5 w-3.5 shrink-0 text-muted" />
       </div>