feat(ui): add sortable column headers to domains table

components/dashboard/dashboard-controls.tsx

@@ -55,6 +55,15 @@ type Domain = {
   updated_at: string;
 };
 
+type DomainSortKey =
+  | "domain"
+  | "status"
+  | "hosting"
+  | "created"
+  | "aliases"
+  | "last_seen"
+  | "actions";
+
 type Props = {
   instances: Instance[];
   subscriptions: Subscription[];
@@ -198,6 +207,10 @@ export function DashboardControls({
   );
   const [domainSearch, setDomainSearch] = useState("");
   const [domainStatus, setDomainStatus] = useState("all");
+  const [domainSort, setDomainSort] = useState<{
+    key: DomainSortKey;
+    direction: "asc" | "desc";
+  }>({ key: "domain", direction: "asc" });
   const [message, setMessage] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
   const [isConnectPanelOpen, setIsConnectPanelOpen] = useState(!hasInstances);
@@ -295,6 +308,112 @@ export function DashboardControls({
     return statusMatches && searchMatches;
   });
 
+  const sortedDomains = filteredDomains
+    .map((domain, index) => ({ domain, index }))
+    .sort((a, b) => {
+      function compareNullable<T>(
+        left: T | null | undefined,
+        right: T | null | undefined,
+        compare: (leftValue: T, rightValue: T) => number,
+      ) {
+        const leftMissing = left == null;
+        const rightMissing = right == null;
+        if (leftMissing && rightMissing) return 0;
+        if (leftMissing) return 1;
+        if (rightMissing) return -1;
+        return compare(left, right);
+      }
+
+      function compareStrings(
+        left: string | null | undefined,
+        right: string | null | undefined,
+      ) {
+        return compareNullable(left, right, (l, r) =>
+          l.localeCompare(r, undefined, { sensitivity: "base" }),
+        );
+      }
+
+      function compareNumbers(
+        left: number | null | undefined,
+        right: number | null | undefined,
+      ) {
+        return compareNullable(left, right, (l, r) => l - r);
+      }
+
+      function toTime(value: string | null | undefined) {
+        if (!value) return null;
+        const time = new Date(value).getTime();
+        return Number.isNaN(time) ? null : time;
+      }
+
+      const leftDomain = a.domain;
+      const rightDomain = b.domain;
+
+      let comparison = 0;
+
+      if (domainSort.key === "domain") {
+        comparison = compareStrings(
+          leftDomain.domain_name,
+          rightDomain.domain_name,
+        );
+      } else if (domainSort.key === "status") {
+        comparison = compareStrings(
+          formatDomainStatusLabel(leftDomain.status),
+          formatDomainStatusLabel(rightDomain.status),
+        );
+      } else if (domainSort.key === "hosting") {
+        comparison = compareStrings(
+          leftDomain.hosting_type,
+          rightDomain.hosting_type,
+        );
+      } else if (domainSort.key === "created") {
+        comparison = compareNumbers(
+          toTime(leftDomain.source_created_at),
+          toTime(rightDomain.source_created_at),
+        );
+      } else if (domainSort.key === "aliases") {
+        comparison = compareNumbers(
+          leftDomain.aliases_count,
+          rightDomain.aliases_count,
+        );
+      } else if (domainSort.key === "last_seen") {
+        comparison = compareNumbers(
+          toTime(leftDomain.updated_at),
+          toTime(rightDomain.updated_at),
+        );
+      } else if (domainSort.key === "actions") {
+        comparison = compareNumbers(
+          leftDomain.subscription_id ? 1 : 0,
+          rightDomain.subscription_id ? 1 : 0,
+        );
+      }
+
+      if (comparison === 0) {
+        comparison = a.index - b.index;
+      }
+
+      return domainSort.direction === "asc" ? comparison : comparison * -1;
+    })
+    .map((entry) => entry.domain);
+
+  function toggleDomainSort(key: DomainSortKey) {
+    setDomainSort((current) => {
+      if (current.key === key) {
+        return {
+          key,
+          direction: current.direction === "asc" ? "desc" : "asc",
+        };
+      }
+
+      return { key, direction: "asc" };
+    });
+  }
+
+  function getSortIndicator(key: DomainSortKey) {
+    if (domainSort.key !== key) return "↕";
+    return domainSort.direction === "asc" ? "↑" : "↓";
+  }
+
   const instanceHealthSummary = instances.reduce(
     (acc, instance) => {
       const status = (instance.health_status ?? "unknown").toLowerCase();
@@ -1094,24 +1213,143 @@ export function DashboardControls({
             <table className="min-w-full text-left text-sm">
               <thead>
                 <tr className="border-b border-slate-200 text-xs uppercase text-slate-500">
-                  <th className="px-2 py-2">Domain</th>
-                  <th className="px-2 py-2">Subscription Status</th>
-                  <th className="px-2 py-2">Hosting</th>
-                  <th className="px-2 py-2">Created</th>
-                  <th className="px-2 py-2">Aliases</th>
-                  <th className="px-2 py-2">Last seen</th>
-                  <th className="px-2 py-2">Actions</th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("domain")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Domain
+                      <span
+                        className={
+                          domainSort.key === "domain"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("domain")}
+                      </span>
+                    </button>
+                  </th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("status")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Subscription Status
+                      <span
+                        className={
+                          domainSort.key === "status"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("status")}
+                      </span>
+                    </button>
+                  </th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("hosting")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Hosting
+                      <span
+                        className={
+                          domainSort.key === "hosting"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("hosting")}
+                      </span>
+                    </button>
+                  </th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("created")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Created
+                      <span
+                        className={
+                          domainSort.key === "created"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("created")}
+                      </span>
+                    </button>
+                  </th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("aliases")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Aliases
+                      <span
+                        className={
+                          domainSort.key === "aliases"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("aliases")}
+                      </span>
+                    </button>
+                  </th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("last_seen")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Last seen
+                      <span
+                        className={
+                          domainSort.key === "last_seen"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("last_seen")}
+                      </span>
+                    </button>
+                  </th>
+                  <th className="px-2 py-2">
+                    <button
+                      type="button"
+                      onClick={() => toggleDomainSort("actions")}
+                      className="inline-flex items-center gap-1"
+                    >
+                      Actions
+                      <span
+                        className={
+                          domainSort.key === "actions"
+                            ? "text-brand-700"
+                            : "text-slate-400"
+                        }
+                      >
+                        {getSortIndicator("actions")}
+                      </span>
+                    </button>
+                  </th>
                 </tr>
               </thead>
               <tbody>
-                {filteredDomains.length === 0 ? (
+                {sortedDomains.length === 0 ? (
                   <tr>
                     <td className="px-2 py-3 text-slate-500" colSpan={7}>
                       No domains found.
                     </td>
                   </tr>
                 ) : (
-                  filteredDomains.map((domain) => (
+                  sortedDomains.map((domain) => (
                     <tr key={domain.id} className="border-b border-slate-100">
                       <td className="px-2 py-2 font-medium text-slate-900">
                         <a