fix(t-paliad-141): collab-suggestions dropdown floats off-screen — parent .form-field had no position. Scope :has() rule sets parent to position:relative only where the dropdown actually exists

frontend/src/styles/global.css

@@ -5856,6 +5856,17 @@ input[type="range"]::-moz-range-thumb {
     padding: 0;
 }
 
+/* `.collab-suggestions` is absolute-positioned with top: 100% — needs a
+   positioned ancestor or it falls back to the viewport's initial
+   containing block and renders off-screen (text is in the DOM, but
+   visually invisible — m hit this on the project team-add picker after
+   t-141 made the dropdown content-visible but still let it float to
+   nowhere). Scoped via :has() so we only flip the parent's position
+   where it actually contains a suggestions dropdown. */
+.form-field:has(> .collab-suggestions) {
+    position: relative;
+}
+
 .collab-suggestions {
     position: absolute;
     top: 100%;