swarm-ui: sortable + filterable table columns

hyperhive#4020, mara. TableColumn gets two new optional extractors,
each one the whole signal for its capability (mara: 'why separate
selector and flag?' — dropped the sortable/filterable booleans that
would've said the same thing twice and could disagree with the
extractor's presence):

- sortBy: (row) => string | number — column is click-to-sort iff
  present. Table owns the sort state (one active column, header click
  cycles none -> ascending -> descending), since a rendered cell often
  isn't the sortable value itself (e.g. AgentsPage's status column
  renders a Badge, not a plain string).
- filterValue: (row) => string — column is filterable iff present. A
  text input row under the headers, substring match case-insensitive.

Client-side only, no backend change - every consuming page already
fetches its full row set. Wired into AgentsPage and HivesPage, the two
pages with a real per-row Table. Left IssueReportPage alone (already
has its own purpose-built sort + label/hide-blocked filters, predates
this and covers its own domain better than a generic per-column text
filter would) and JobsPage alone (renders an indented state tree via
JobqGraph, no column table at all despite what my original scoping
comment assumed).

Verified: typecheck + build clean, nix fmt clean, static render of the
actual built CSS confirms the new sort-header + filter-row markup
doesn't break table layout.

frontend/packages/swarm-ui/src/pages/AgentsPage.tsx

@@ -207,8 +207,20 @@ export function AgentsPage() {
   }
 
   const columns: TableColumn<AgentRow>[] = [
-    { key: "name", header: "name", render: (a) => a.name },
+    {
-    { key: "hive", header: "hive", render: (a) => a.hive ?? "—" },
+      key: "name",
+      header: "name",
+      render: (a) => a.name,
+      sortBy: (a) => a.name,
+      filterValue: (a) => a.name,
+    },
+    {
+      key: "hive",
+      header: "hive",
+      render: (a) => a.hive ?? "—",
+      sortBy: (a) => a.hive ?? "",
+      filterValue: (a) => a.hive ?? "",
+    },
     {
       key: "status",
       header: "status",
@@ -217,6 +229,8 @@ export function AgentsPage() {
       // stuffed a full sentence into a pill meant for a short discrete
       // label and blew the row out (mara: "looks messy"). That string
       // now lives in its own "message" column below.
+      sortBy: (a) => FRESHNESS[a.freshness].label,
+      filterValue: (a) => FRESHNESS[a.freshness].label,
       render: (a) => {
         const { tone, label } = FRESHNESS[a.freshness];
         return (
@@ -252,6 +266,7 @@ export function AgentsPage() {
       // `status_text: null` (the wire contract's own rule), so a stopped
       // agent just shows an em dash here rather than a stale message.
       render: (a) => a.snapshot?.status_text ?? "—",
+      filterValue: (a) => a.snapshot?.status_text ?? "",
     },
     {
       key: "wanted",
@@ -261,6 +276,8 @@ export function AgentsPage() {
       // control" shape (see its header comment, which names pause/resume
       // as the exact motivating case), not a separate status chip next
       // to a separate button.
+      sortBy: (a) => a.wanted ?? "",
+      filterValue: (a) => a.wanted ?? "no declaration",
       render: (a) => {
         const pending = pendingAgents.has(a.name);
         const impliedCurrent =
@@ -295,6 +312,8 @@ export function AgentsPage() {
     {
       key: "config-pr",
       header: "config PR",
+      sortBy: (a) => a.config_pr?.pr_number ?? 0,
+      filterValue: (a) => (a.config_pr ? `#${a.config_pr.pr_number}` : ""),
       render: (a) =>
         a.config_pr ? (
           <Badge

frontend/packages/swarm-ui/src/pages/HivesPage.tsx

@@ -49,7 +49,13 @@ const FRESHNESS: Record<Freshness, { tone: BadgeTone; label: string }> = {
 };
 
 const COLUMNS: TableColumn<HiveStatus>[] = [
-  { key: "name", header: "name", render: (h) => h.name },
+  {
+    key: "name",
+    header: "name",
+    render: (h) => h.name,
+    sortBy: (h) => h.name,
+    filterValue: (h) => h.name,
+  },
   {
     key: "domain",
     header: "domain",
@@ -61,6 +67,8 @@ const COLUMNS: TableColumn<HiveStatus>[] = [
       ) : (
         "—"
       ),
+    sortBy: (h) => h.domain ?? "",
+    filterValue: (h) => h.domain ?? "",
   },
   {
     key: "status",
@@ -82,6 +90,8 @@ const COLUMNS: TableColumn<HiveStatus>[] = [
         />
       );
     },
+    sortBy: (h) => FRESHNESS[h.freshness].label,
+    filterValue: (h) => FRESHNESS[h.freshness].label,
   },
 ];
 

frontend/packages/swarm-ui/src/ui/table/Table.css

@@ -35,3 +35,49 @@
   white-space: normal;
   word-break: break-word;
 }
+
+/* Sortable header — the whole header cell is the click target, not a
+   separate icon-only button next to it, same "control lives on the
+   thing it affects" reasoning as `Badge`'s own click-to-toggle shape. */
+.ui-table-sort-button {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.35em;
+  background: none;
+  border: none;
+  padding: 0;
+  margin: 0;
+  font: inherit;
+  font-weight: 600;
+  color: inherit;
+  cursor: pointer;
+}
+.ui-table-sort-button:hover {
+  color: var(--fg);
+}
+.ui-table-sort-glyph {
+  opacity: 0.6;
+  font-size: 0.85em;
+}
+.ui-table-sort-button:hover .ui-table-sort-glyph {
+  opacity: 1;
+}
+
+/* The per-column filter inputs' row — same cell padding as a header row,
+   no bottom border of its own (the header row above already has one). */
+.ui-table-filter-row th {
+  padding-top: 0;
+  padding-bottom: 0.5em;
+  font-weight: 400;
+}
+.ui-table-filter-input {
+  width: 100%;
+  box-sizing: border-box;
+  background: var(--bg);
+  color: var(--fg);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 0.25em 0.5em;
+  font: inherit;
+  font-size: 0.9em;
+}

frontend/packages/swarm-ui/src/ui/table/Table.tsx

@@ -9,6 +9,7 @@
 // a `<table>` doesn't shrink below its content's natural width on its
 // own, so without this the page itself would break, not just look
 // cramped.
+import { useMemo, useState } from "preact/hooks";
 import type { ComponentChildren } from "preact";
 import "./Table.css";
 
@@ -29,12 +30,44 @@ export interface TableColumn<T> {
    * `'descending'` while this is the active sort column, `'none'` while
    * sortable but not active, omitted entirely for a non-sortable column
    * (no `aria-sort` attribute at all, the correct value for a column
-   * that can never be the active sort). A screen reader announces which
+   * that can never be the active sort). Only consulted for a column with
-   * column/direction is active from this attribute; the ▲/▼ glyph a
+   * no `sortBy` — one with `sortBy` gets its `aria-sort` computed from
-   * sortable header renders is `aria-hidden` and carries no information
+   * `Table`'s own sort state instead. Kept for the issue-report page's
-   * on its own.
+   * pre-existing hand-rolled sortable headers (real `<button>` markup as
+   * `header`, its own click handling), which predate `sortBy` and don't
+   * need to be ported to it just because it now exists.
    */
   ariaSort?: "ascending" | "descending" | "none";
+  /**
+   * Column is click-to-sort when present — extracts the comparable
+   * value from a row (a rendered cell is often not that value itself,
+   * e.g. a status column rendering a `Badge`). `Table` owns the actual
+   * sort state (one active column, cycling none → ascending →
+   * descending on header click); the column only says how to compare
+   * its own rows. String values compare case-insensitively, numbers
+   * numerically — deliberately no separate `sortable` flag alongside
+   * this: the extractor's presence already answers whether the column
+   * sorts, so there's no second flag that could disagree with it.
+   */
+  sortBy?: (row: T) => string | number;
+  /**
+   * Column is filterable (a text input in its own row under the
+   * headers) when present — extracts the substring to match a case-
+   * insensitive filter query against. Same one-signal reasoning as
+   * `sortBy`: no separate `filterable` flag, the extractor's presence
+   * is the flag.
+   */
+  filterValue?: (row: T) => string;
+}
+
+type SortDir = "asc" | "desc";
+
+function compareValues(a: string | number, b: string | number): number {
+  if (typeof a === "number" && typeof b === "number") return a - b;
+  return String(a).localeCompare(String(b), undefined, {
+    sensitivity: "base",
+    numeric: true,
+  });
 }
 
 export function Table<T>({
@@ -53,17 +86,112 @@ export function Table<T>({
   // opt-in rather than every table growing a mandatory default string.
   emptyMessage?: ComponentChildren;
 }) {
+  // One active sort column at a time, same as any spreadsheet — a
+  // multi-column sort is real complexity (tie-break order, a UI to
+  // express it) nothing here has asked for yet.
+  const [sort, setSort] = useState<{ key: string; dir: SortDir } | null>(null);
+  // Filter text per filterable column key, only populated for a column
+  // whose input the operator has actually typed into.
+  const [filters, setFilters] = useState<Record<string, string>>({});
+
+  const filterableColumns = columns.filter((c) => c.filterValue);
+  const activeFilters = Object.entries(filters).filter(([, v]) => v !== "");
+
+  const visibleRows = useMemo(() => {
+    let out = rows;
+    if (activeFilters.length > 0) {
+      out = out.filter((row) =>
+        activeFilters.every(([key, query]) => {
+          const col = columns.find((c) => c.key === key);
+          const value = col?.filterValue?.(row) ?? "";
+          return value.toLowerCase().includes(query.toLowerCase());
+        }),
+      );
+    }
+    if (sort) {
+      const col = columns.find((c) => c.key === sort.key);
+      const sortBy = col?.sortBy;
+      if (sortBy) {
+        out = [...out].sort((a, b) => {
+          const cmp = compareValues(sortBy(a), sortBy(b));
+          return sort.dir === "asc" ? cmp : -cmp;
+        });
+      }
+    }
+    return out;
+    // eslint-disable-next-line react-hooks/exhaustive-deps -- `columns` is
+    // a fresh array every render (built inline by every caller); keying
+    // off its identity would recompute every render regardless, so this
+    // depends on the values that actually determine the output instead.
+  }, [rows, sort, JSON.stringify(activeFilters)]);
+
+  function toggleSort(key: string) {
+    setSort((prev) => {
+      if (prev?.key !== key) return { key, dir: "asc" };
+      if (prev.dir === "asc") return { key, dir: "desc" };
+      return null;
+    });
+  }
+
+  function ariaSortFor(
+    c: TableColumn<T>,
+  ): "ascending" | "descending" | "none" | undefined {
+    if (!c.sortBy) return c.ariaSort;
+    if (sort?.key !== c.key) return "none";
+    return sort.dir === "asc" ? "ascending" : "descending";
+  }
+
   return (
     <div class="ui-table-scroll">
       <table class="ui-table">
         <thead>
           <tr>
-            {columns.map((c) => (
+            {columns.map((c) =>
-              <th key={c.key} aria-sort={c.ariaSort}>
+              c.sortBy ? (
-                {c.header}
+                <th key={c.key} aria-sort={ariaSortFor(c)}>
-              </th>
+                  <button
-            ))}
+                    type="button"
+                    class="ui-table-sort-button"
+                    onClick={() => toggleSort(c.key)}
+                  >
+                    {c.header}
+                    <span class="ui-table-sort-glyph" aria-hidden="true">
+                      {sort?.key === c.key
+                        ? sort.dir === "asc"
+                          ? "▲"
+                          : "▼"
+                        : "↕"}
+                    </span>
+                  </button>
+                </th>
+              ) : (
+                <th key={c.key} aria-sort={ariaSortFor(c)}>
+                  {c.header}
+                </th>
+              ),
+            )}
           </tr>
+          {filterableColumns.length > 0 ? (
+            <tr class="ui-table-filter-row">
+              {columns.map((c) => (
+                <th key={c.key}>
+                  {c.filterValue ? (
+                    <input
+                      type="text"
+                      class="ui-table-filter-input"
+                      placeholder="filter…"
+                      aria-label={`filter by ${typeof c.header === "string" ? c.header : c.key}`}
+                      value={filters[c.key] ?? ""}
+                      onInput={(e) => {
+                        const v = (e.target as HTMLInputElement).value;
+                        setFilters((prev) => ({ ...prev, [c.key]: v }));
+                      }}
+                    />
+                  ) : null}
+                </th>
+              ))}
+            </tr>
+          ) : null}
         </thead>
         <tbody>
           {rows.length === 0 && emptyMessage ? (
@@ -72,8 +200,17 @@ export function Table<T>({
                 {emptyMessage}
               </td>
             </tr>
+          ) : rows.length > 0 && visibleRows.length === 0 ? (
+            // Distinct from `emptyMessage` — real rows exist, the active
+            // filter(s) just matched none of them, not "there's nothing
+            // here at all".
+            <tr>
+              <td class="ui-table-empty" colSpan={columns.length}>
+                no rows match the current filter
+              </td>
+            </tr>
           ) : (
-            rows.map((row) => (
+            visibleRows.map((row) => (
               <tr key={rowKey(row)}>
                 {columns.map((c) => (
                   <td key={c.key} class={c.cellClass}>