Use a steady terminal cursor to fix typing lag on ProMotion displays

docs/macos.md

@@ -97,7 +97,7 @@ Closing the window leaves the app running with its store and streams (`applicati
 - **Composer.** A `TextEditor`, with paste and drop handled as in "Gaps in SwiftUI". Text, the model menu (filtered to the live session's vendor), Interrupt and Send. Enter sends, Shift-Enter adds a newline, and Enter during IME composition does neither. Pasted or dropped PNG, JPEG, GIF and WebP images become thumbnails with ×, uploaded to `POST /api/blobs` on send; any other image `NSBitmapImageRep` decodes, such as TIFF, is converted to PNG first, its size checked after conversion. A failed send puts the text and images back and shows the error.
 - **Inbox.** The selected task's oldest open item, rendered from its Markdown context with each choice's marker replaced by a clickable block (pick-one, sends at once) or checkbox (pick-any, with Submit), the "recommended" tag, image-choice grids, attachments, Let the agent decide, Other… and, for errors, Reply… and Dismiss. Arrow keys move between choices. A 409 shows its error. The Changes summary line sits above it.
 - **Changes, Files, Reviews, Workflow, Project, Status, Settings.** Including the pinned-snapshot stepper, open-diff memory, per-task place in Files, finding diffs with Fix and Ignore, nested subtasks, TODO Start and Discuss, rate-limit pace bars and lead notes. The Workflow tab draws its stage graph natively from the `WorkflowRun` (stages as boxes coloured by state, `after` as edges, laid out top to bottom by depth) with the layout and drawing code from "Diagrams", fed from the run's data rather than Mermaid text.
-- **Terminal.** A terminal view attached to `GET /api/tasks/{taskId}/terminal` with `URLSessionWebSocketTask`: binary input and output, `TerminalSize` JSON on resize, close code 4000 for `shell ended: <status>` with New shell, 1011 for a start failure, reconnect after 2 s while the task is active, one socket per open tab and selected task. Colours come from the palette. Ctrl combinations typed in it go to the shell.
+- **Terminal.** A terminal view attached to `GET /api/tasks/{taskId}/terminal` with `URLSessionWebSocketTask`: binary input and output, `TerminalSize` JSON on resize, close code 4000 for `shell ended: <status>` with New shell, 1011 for a start failure, reconnect after 2 s while the task is active, one socket per open tab and selected task. Colours come from the palette. Ctrl combinations typed in it go to the shell. The cursor is a steady block (`setCursorStyle(.steadyBlock)` when the view is made): SwiftTerm's blinking cursor restarts its Core Animation fade on every keypress, scheduled 0.7 s out, and on a ProMotion (variable refresh rate) display macOS then holds the window's screen update until that fade starts, so each typed letter appears about 0.7 s late. A program in the shell can still ask for a blinking cursor with DECSCUSR.
 - **Switcher.** The ⌘K overlay, also opened by clicking the task picker, centred below the picker: tasks with inbox items first, then least recently visited, the selected task last, the `name: title` project prefix, New task, Start in …, Start workflow… and its second step, projects, Escape stepping back, and the list scrolling to keep the highlighted row in view. Picking a task opens its Inbox when it has items, its unread summary when it has one, and its Transcript otherwise.
 - **Merge and Discard.** The transcript head's Merge button is enabled once `GET /api/tasks/{taskId}/unmerged` reports commits or files, refetched 1.5 s after a tool result or turn end. `confirmMerge` (`MergeDialog.swift`): the editable commit title (at most 72 characters, kept across a warning link's detour), co-authors, warnings that refetch on the task's snapshot and review events and link to the Reviews or Inbox tab, the parent-or-default-branch choice for subtasks, and Merge now / After review while the latest snapshot's review is running. It is centred in the right pane. Discard confirms below its button, then clears the focused task.
 

mac/Sources/Byre/Terminal.swift

@@ -79,6 +79,7 @@ struct TerminalHost: NSViewRepresentable {
         let t = TerminalView(frame: NSRect(x: 0, y: 0, width: 800, height: 400))
         t.font = Fonts.ns(13)
         t.changeScrollback(5000)
+        t.setCursorStyle(.steadyBlock)
         t.terminalDelegate = context.coordinator
         context.coordinator.view = t
         DispatchQueue.main.async {