feat: add BoardSettingsDropdown to top-right UI panel

Added the board settings dropdown between ShareBoardButton and StarBoardButton.
Provides access to:
- Board protection toggle (view-only mode)
- Editor management for protected boards
- Admin request functionality

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/ui/components.tsx

@@ -11,6 +11,7 @@ import { NetworkGraphPanel } from "../components/networking"
 import CryptIDDropdown from "../components/auth/CryptIDDropdown"
 import StarBoardButton from "../components/StarBoardButton"
 import ShareBoardButton from "../components/ShareBoardButton"
+import BoardSettingsDropdown from "../components/BoardSettingsDropdown"
 import { SettingsDialog } from "./SettingsDialog"
 // import { VersionHistoryPanel } from "../components/history" // TODO: Re-enable when version reversion is ready
 import { useAuth } from "../context/AuthContext"
@@ -324,6 +325,13 @@ function CustomSharePanel() {
 
         <Separator />
 
+        {/* Board settings (protection toggle, editor management) */}
+        <div style={{ padding: '0 2px' }}>
+          <BoardSettingsDropdown className="share-panel-btn" />
+        </div>
+
+        <Separator />
+
         {/* Star board button */}
         <div style={{ padding: '0 2px' }}>
           <StarBoardButton className="share-panel-btn" />