ui: stabilize file table status column

Fix table layout and reserve a single-line status column wide enough for upload progress and processing statuses.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

site/templates/index.html

@@ -181,16 +181,34 @@
     #filePicker .fp-table-wrap {
       border: 1px solid var(--brand-gray);
       border-radius: 12px;
-      overflow: hidden;
+      overflow-x: auto;
       margin-bottom: 6px;
     }
 
     #filePicker .fp-table {
       width: 100%;
+      min-width: 740px;
       border-collapse: collapse;
+      table-layout: fixed;
       font-size: 14px;
     }
 
+    #filePicker .fp-table th:nth-child(1) {
+      width: 47%;
+    }
+
+    #filePicker .fp-table th:nth-child(2) {
+      width: 15%;
+    }
+
+    #filePicker .fp-table th:nth-child(3) {
+      width: 220px;
+    }
+
+    #filePicker .fp-table th:nth-child(4) {
+      width: 8%;
+    }
+
     #filePicker .fp-table th {
       background: var(--brand-grey-light);
       padding: 10px 16px;
@@ -209,6 +227,12 @@
       color: var(--text);
     }
 
+    #filePicker .fp-table td:nth-child(3) {
+      white-space: nowrap;
+      overflow: hidden;
+      text-overflow: ellipsis;
+    }
+
     #filePicker .fp-table tr:last-child td {
       border-bottom: 0;
     }