feat: apikey alias field + markdown/patch authorship display

- ApiKeyCreationModal: required Alias input (reuse alias = renew, with
  banner); align roles to backend allowlist (guest -> user, default
  user); fix copy bug (generatedKey.key).
- MarkdownContent + PatchCards: show author / created / last modified
  (+ by whom); formatDateTime helper (null -> "—").

Branched off fix/buildconfig-cachebust (carries the contenthash +
BuildConfig fix already deployed to prod).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/Markdowns/PatchCards.js

@@ -1,5 +1,6 @@
 import React, { useState } from "react";
-import { Plus, Pencil, Trash2, Save, Layers } from "lucide-react";
+import { Plus, Pencil, Trash2, Save, Layers, User, Clock } from "lucide-react";
+import { formatDateTime } from "../../lib/utils";
 import MarkdownView from "./MarkdownView";
 import PermissionGuard from "../PermissionGuard";
 import {
@@ -137,6 +138,22 @@ const PatchCards = ({ markdownId }) => {
                                 </div>
                             </PermissionGuard>
                         </div>
+                        <div className="flex flex-wrap items-center gap-x-4 gap-y-1 border-b border-border/40 px-5 py-1.5 font-mono text-[11px] text-muted-foreground">
+                            <span className="inline-flex items-center gap-1">
+                                <User className="h-3 w-3 text-secondary" />
+                                {patch.author || "—"}
+                            </span>
+                            <span className="inline-flex items-center gap-1">
+                                <Clock className="h-3 w-3" />
+                                {formatDateTime(patch.created_at)}
+                            </span>
+                            <span className="inline-flex items-center gap-1">
+                                edited {formatDateTime(patch.updated_at)}
+                                {patch.last_modified_by
+                                    ? ` by ${patch.last_modified_by}`
+                                    : ""}
+                            </span>
+                        </div>
                         <div className="px-5 py-4">
                             <MarkdownView content={{ markdown: patch.content }} />
                         </div>