Add dropdown with toggle functionality to OwnerPicker

Introduced a dropdown feature to the OwnerPicker component, allowing users to search or browse owners more effectively. The dropdown can be toggled open/closed and includes improved styling for better user experience. Added click-outside functionality to automatically close the dropdown when users interact elsewhere.

frontend/src/pages/TargetsPage.jsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from "react";
+import React, { useEffect, useRef, useState } from "react";
 import { Link } from "react-router-dom";
 import { apiFetch } from "../api";
 import { useAuth } from "../state";
@@ -34,13 +34,25 @@ function toggleOwner(ids, userId) {
 }
 
 function OwnerPicker({ candidates, selectedIds, onToggle, query, onQueryChange }) {
+  const pickerRef = useRef(null);
+  const [open, setOpen] = useState(false);
   const filtered = candidates.filter((item) =>
     item.email.toLowerCase().includes(query.trim().toLowerCase())
   );
   const selected = candidates.filter((item) => selectedIds.includes(item.user_id));
 
+  useEffect(() => {
+    const onPointerDown = (event) => {
+      if (!pickerRef.current?.contains(event.target)) {
+        setOpen(false);
+      }
+    };
+    document.addEventListener("mousedown", onPointerDown);
+    return () => document.removeEventListener("mousedown", onPointerDown);
+  }, []);
+
   return (
-    <div className="owner-picker">
+    <div className="owner-picker" ref={pickerRef}>
       <div className="owner-selected">
         {selected.length > 0 ? (
           selected.map((item) => (
@@ -59,30 +71,41 @@ function OwnerPicker({ candidates, selectedIds, onToggle, query, onQueryChange }
           <span className="muted">No owners selected yet.</span>
         )}
       </div>
-      <input
-        type="text"
-        className="owner-search-input"
-        value={query}
-        onChange={(e) => onQueryChange(e.target.value)}
-        placeholder="Search users by email..."
-      />
-      <div className="owner-search-results">
-        {filtered.map((item) => {
-          const active = selectedIds.includes(item.user_id);
-          return (
-            <button
-              key={item.user_id}
-              type="button"
-              className={`owner-result ${active ? "active" : ""}`}
-              onClick={() => onToggle(item.user_id)}
-            >
-              <span>{item.email}</span>
-              <small>{item.role}</small>
-            </button>
-          );
-        })}
-        {filtered.length === 0 && <div className="owner-result-empty">No matching users.</div>}
+      <div className={`owner-search-shell ${open ? "open" : ""}`}>
+        <input
+          type="text"
+          className="owner-search-input"
+          value={query}
+          onChange={(e) => onQueryChange(e.target.value)}
+          onFocus={() => setOpen(true)}
+          onClick={() => setOpen(true)}
+          placeholder="Search users by email..."
+        />
+        <button type="button" className="owner-search-toggle" onClick={() => setOpen((prev) => !prev)}>
+          v
+        </button>
       </div>
+      {open && (
+        <div className="owner-dropdown">
+          <div className="owner-search-results">
+            {filtered.map((item) => {
+              const active = selectedIds.includes(item.user_id);
+              return (
+                <button
+                  key={item.user_id}
+                  type="button"
+                  className={`owner-result ${active ? "active" : ""}`}
+                  onClick={() => onToggle(item.user_id)}
+                >
+                  <span>{item.email}</span>
+                  <small>{item.role}</small>
+                </button>
+              );
+            })}
+            {filtered.length === 0 && <div className="owner-result-empty">No matching users.</div>}
+          </div>
+        </div>
+      )}
     </div>
   );
 }

frontend/src/styles.css

@@ -752,6 +752,7 @@ button {
 .owner-picker {
   display: grid;
   gap: 8px;
+  position: relative;
 }
 
 .owner-selected {
@@ -774,14 +775,48 @@ button {
   font-weight: 600;
 }
 
+.owner-search-shell {
+  display: grid;
+  grid-template-columns: 1fr auto;
+  gap: 0;
+}
+
+.owner-search-shell.open .owner-search-input {
+  border-bottom-left-radius: 0;
+  border-bottom-right-radius: 0;
+}
+
 .owner-search-input {
   width: 100%;
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
+}
+
+.owner-search-toggle {
+  border-top-left-radius: 0;
+  border-bottom-left-radius: 0;
+  min-width: 38px;
+  font-weight: 700;
+  padding: 0 10px;
+}
+
+.owner-dropdown {
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: calc(100% - 2px);
+  z-index: 10;
+  border: 1px solid #3c73ac;
+  border-radius: 0 0 10px 10px;
+  background: #0f2549;
+  box-shadow: 0 12px 26px #03112777;
+  padding: 8px;
 }
 
 .owner-search-results {
   display: grid;
   gap: 6px;
-  max-height: 150px;
+  max-height: 180px;
   overflow: auto;
   padding-right: 2px;
 }