blockframe-header: show frame:title in durable shell block headers

Durable shell-controller blocks (used by remote/SSH terminal panes,
including via wsh createblock) render their header with useTermHeader
true, which skips the entire viewName/frame:title block entirely - so
frame:title had no effect for these blocks even though it works for
every other block type. This left every durable pane on a given
connection showing an identical, generic connection-name header with
no way to distinguish them (e.g. multiple tmux-attached sessions on
the same host).

Render frame:title inside the useTermHeader branch too, next to the
connection button, so a caller (wsh setmeta / wsh createblock) can
label a durable session distinctly.

Author: andrewinalaska

frontend/app/block/blockframe-header.tsx

@@ -271,6 +271,11 @@ const BlockFrame_Header = ({
                     isTerminalBlock={isTerminalBlock}
                 />
             )}
+            {useTermHeader && metaFrameTitle && (
+                <div className="block-frame-view-type" key="frame-title">
+                    {metaFrameTitle}
+                </div>
+            )}
             {useTermHeader && termConfigedDurable != null && (
                 <DurableSessionFlyover
                     key="durable-status"