Add Evidence sidebar text filter for CE-WP-0010.

Filter input next to the Evidence caption; case-insensitive match on quote,
commentary, and status when the query has three or more characters.

src/work/EvidenceSidebar.tsx

@@ -104,6 +104,22 @@ function annotationOrderKey(annotation: Annotation | null): number {
   return docOrderKey(annotation.selectors);
 }
 
+const FILTER_MIN_CHARS = 3;
+
+function matchesEvidenceFilter(
+  query: string,
+  quote: string,
+  commentary: string | undefined,
+  status: string,
+): boolean {
+  const q = query.trim();
+  if (q.length < FILTER_MIN_CHARS) return true;
+  const needle = q.toLowerCase();
+  return [quote, commentary ?? "", status].some((p) =>
+    p.toLowerCase().includes(needle),
+  );
+}
+
 export function EvidenceSidebar(props: EvidenceSidebarProps) {
   const engine = useEngine();
   const { document } = useActiveDocument();
@@ -117,6 +133,8 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
   const annotationUpdateTick = useEngineEventTick("AnnotationUpdated");
   const revision = useEngineRevision();
 
+  const [filterQuery, setFilterQuery] = useState("");
+
   // Build the sorted view-model: each item gets its order key + the
   // first annotation up-front so the render below doesn't have to
   // re-resolve them inside the map.
@@ -139,6 +157,17 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
     revision,
   ]);
 
+  const filteredItems = useMemo(() => {
+    return sortedItems.filter(({ item, annotation }) =>
+      matchesEvidenceFilter(
+        filterQuery,
+        annotation?.quote ?? "",
+        item.commentary,
+        item.status,
+      ),
+    );
+  }, [sortedItems, filterQuery]);
+
   const pendingOrder = useMemo<number>(() => {
     if (!pending) return Number.POSITIVE_INFINITY;
     const c = pending.capture;
@@ -148,15 +177,15 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
     return c.startOffset;
   }, [pending]);
 
-  // Find the insert position for the pending capture form: first index
-  // whose order > pendingOrder, or sortedItems.length to append.
+  // Insert pending capture among the *unfiltered* document order so a
+  // narrow filter cannot hide the in-progress capture form.
   const pendingInsertIndex = useMemo(() => {
     if (!pending) return -1;
-    for (let i = 0; i < sortedItems.length; i++) {
-      if (sortedItems[i]!.order > pendingOrder) return i;
+    for (let i = 0; i < filteredItems.length; i++) {
+      if (filteredItems[i]!.order > pendingOrder) return i;
     }
-    return sortedItems.length;
-  }, [pending, pendingOrder, sortedItems]);
+    return filteredItems.length;
+  }, [pending, pendingOrder, filteredItems]);
 
   const [openExportFor, setOpenExportFor] = useState<EvidenceItemId | null>(null);
   const [editingId, setEditingId] = useState<EvidenceItemId | null>(null);
@@ -249,6 +278,7 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
 
   return (
     <aside
+      aria-label="Evidence"
       style={{
         width: 320,
         borderLeft: "1px solid #ddd",
@@ -259,7 +289,33 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
         position: "relative",
       }}
     >
-      <h2 style={{ marginTop: 0, fontSize: 16 }}>Evidence</h2>
+      <div
+        style={{
+          display: "flex",
+          alignItems: "center",
+          gap: 8,
+          marginBottom: 8,
+          flexWrap: "wrap",
+        }}
+      >
+        <h2 style={{ margin: 0, fontSize: 16, flex: "0 0 auto" }}>Evidence</h2>
+        <input
+          type="search"
+          value={filterQuery}
+          onChange={(e) => setFilterQuery(e.target.value)}
+          placeholder="Filter…"
+          aria-label="Filter evidence"
+          data-testid="evidence-filter"
+          style={{
+            flex: "1 1 100px",
+            minWidth: 80,
+            fontSize: 12,
+            padding: "4px 6px",
+            border: "1px solid #ccc",
+            borderRadius: 4,
+          }}
+        />
+      </div>
       {!document && (
         <p style={{ fontSize: 12, color: "#888" }}>No document open.</p>
       )}
@@ -269,8 +325,19 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
           capture.
         </p>
       )}
+      {document &&
+        sortedItems.length > 0 &&
+        filteredItems.length === 0 &&
+        !pending && (
+          <p
+            style={{ fontSize: 12, color: "#888" }}
+            data-testid="evidence-filter-empty"
+          >
+            No matches.
+          </p>
+        )}
       <ul style={{ listStyle: "none", padding: 0, margin: 0 }}>
-        {sortedItems.map((entry, i) => {
+        {filteredItems.map((entry, i) => {
           const slotForCapture = pendingInsertIndex === i;
           return (
             <Fragment key={entry.item.id}>
@@ -314,7 +381,7 @@ export function EvidenceSidebar(props: EvidenceSidebarProps) {
             </Fragment>
           );
         })}
-        {pendingInsertIndex === sortedItems.length && (
+        {pendingInsertIndex === filteredItems.length && (
           <li>
             <InlineCaptureForm />
           </li>