fix(drug-reference): make the interaction comparison readable at five drugs

The comparison view laid its columns out on an equal-fraction CSS grid
(repeat(N, minmax(0, 1fr))), so each added drug shrank every column; at the
five-drug maximum the FDA interaction text was squeezed into unreadable slivers.

Lay the columns out with flex instead: full-width and stacked on phones, then
fixed-width columns that scroll sideways from the sm: breakpoint up, so they
never shrink below a readable width. Theme the columns with the same palette as
the rest of the page (they were on stock gray), and give the headers a fixed
min-height so columns line up when drug names wrap.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

admin/inertia/components/drug-reference/InteractionColumn.tsx

@@ -20,35 +20,35 @@ export default function InteractionColumn({ entry, onRemove }: Props) {
   const displayName = entry.brand_name ?? entry.generic_name ?? 'Unknown Drug'
 
   return (
-    <div className="flex flex-col min-w-0 border border-gray-200 rounded-lg overflow-hidden">
-      {/* Column header */}
-      <div className="bg-gray-50 border-b border-gray-200 px-4 py-3">
-        <div className="flex items-start justify-between gap-2">
+    <div className="flex h-full flex-col min-w-0 border border-desert-tan-lighter rounded-lg overflow-hidden">
+      {/* Column header — fixed min-height so columns line up even when names wrap */}
+      <div className="flex min-h-[3.5rem] bg-desert-sand border-b border-desert-tan-lighter px-4 py-3">
+        <div className="flex w-full items-start justify-between gap-2">
           <div className="min-w-0 flex-1">
             <div className="flex flex-wrap items-center gap-1.5 mb-0.5">
-              <span className="font-semibold text-sm text-gray-900 break-words">
+              <span className="font-medium text-sm text-desert-green-dark break-words">
                 {displayName}
               </span>
               {isRx && (
-                <span className="px-1.5 py-0.5 rounded text-xs font-semibold bg-orange-100 text-orange-700 border border-orange-200 flex-shrink-0">
+                <span className="px-1.5 py-0.5 rounded text-xs font-semibold bg-desert-orange text-desert-white flex-shrink-0">
                   Rx
                 </span>
               )}
               {isOtc && (
-                <span className="px-1.5 py-0.5 rounded text-xs font-semibold bg-blue-100 text-blue-700 border border-blue-200 flex-shrink-0">
+                <span className="px-1.5 py-0.5 rounded text-xs font-semibold bg-desert-tan text-desert-white flex-shrink-0">
                   OTC
                 </span>
               )}
             </div>
             {entry.brand_name && entry.generic_name && (
-              <p className="text-xs text-gray-500 italic truncate">{entry.generic_name}</p>
+              <p className="text-xs text-desert-stone italic truncate">{entry.generic_name}</p>
             )}
           </div>
           <button
             type="button"
             onClick={() => onRemove(entry.id)}
             aria-label={`Remove ${displayName} from comparison`}
-            className="flex-shrink-0 text-gray-400 hover:text-gray-600 transition-colors text-lg leading-none ml-1 mt-0.5"
+            className="flex-shrink-0 text-desert-stone-light hover:text-desert-stone-dark transition-colors text-lg leading-none ml-1 mt-0.5"
           >
             ×
           </button>
@@ -56,11 +56,11 @@ export default function InteractionColumn({ entry, onRemove }: Props) {
       </div>
 
       {/* Label text, parsed into readable blocks (FDA wording kept verbatim). */}
-      <div className="px-4 py-3 flex-1 space-y-3">
+      <div className="px-4 py-3 flex-1 space-y-3 text-desert-stone-dark">
         {entry.drug_interactions ? (
           <LabelBlocks text={entry.drug_interactions} />
         ) : (
-          <p className="text-sm text-gray-400 italic">
+          <p className="text-sm text-desert-stone-light italic">
             No labeled interaction text on this label.
           </p>
         )}

admin/inertia/pages/drug-reference/interactions.tsx

@@ -268,14 +268,13 @@ export default function DrugReferenceInteractions({ ingestStatus, rowCount }: Pa
                 <p className="text-sm">Loading…</p>
               </div>
             ) : (
-              <div
-                className="grid gap-4"
-                style={{
-                  gridTemplateColumns: `repeat(${Math.max(1, entries.length)}, minmax(0, 1fr))`,
-                }}
-              >
+              // Stacked single-column on phones; fixed-min-width columns that
+              // scroll sideways (never crush) from sm: up, even at MAX_COMPARE.
+              <div className="flex flex-col gap-3 sm:flex-row sm:gap-3 sm:overflow-x-auto sm:pb-2">
                 {entries.map((entry) => (
-                  <InteractionColumn key={entry.id} entry={entry} onRemove={removeId} />
+                  <div key={entry.id} className="w-full sm:flex-none sm:w-60">
+                    <InteractionColumn entry={entry} onRemove={removeId} />
+                  </div>
                 ))}
               </div>
             )}