feat(run): wire Workspace to TerminalView, delete the stream-json Run feature

Combines three tasks that couldn't land as separate commits: the
pre-commit hook's full test run crashes on any intermediate state
where Workspace.tsx still imports the files being deleted, so the
deletion (old RunConsole/useRunStream/run-spawner/stream-json-parser),
the RunSetup/RunHistory type adjustments, and this file's own
TerminalView wiring had to be staged together and committed as one
hook-passable unit.

- Delete RunConsole.tsx, useRunStream.ts, server/lib/run-spawner.js,
  server/lib/stream-json-parser.js and their tests (Task 8).
- Adjust RunSetup.tsx/RunHistory.tsx to the tmux-backed RunHandle/
  RunStartArgs/DashboardRunHistoryItem shapes, remove mode selection
  UI (Task 9).
- Swap Workspace.tsx's chat-bubble run console for TerminalView
  (xterm.js over /ws-pty/:runId), drop the stream-json envelope
  plumbing, update Start/Resume to the new RunStartArgs payload.
  Create onStartFromSetup handler to work with RunSetup's new callback
  shape. Remove mode state and related plumbing. Remove send/followUp
  state (no longer using old RunConsole chat interface).
- Add promptPlaceholderTerminal i18n key to support RunSetup's new
  placeholder text (Task 10).
- Update Workspace.test.tsx to mock TerminalView component.
- Regenerate screens.snapshot.test.tsx snapshot (only Workspace run
  panel changes: terminal container instead of chat bubbles).

client/src/components/run/__tests__/RunHistory.test.tsx

@@ -29,12 +29,10 @@ const activeRuns = {
     {
       id: LIVE_ID,
       sessionId: "sess-live",
-      mode: "conversation",
       cwd: "/tmp/live",
       model: "claude-opus-5",
       status: "running",
-      prompt: "the live prompt",
-      startedAt: 3000,
+      startedAt: "2000-01-01T00:50:00Z",
       endedAt: null,
     },
   ],
@@ -44,7 +42,6 @@ function historyItem(over: Partial<DashboardRunHistoryItem>): DashboardRunHistor
   return {
     id: PAST_ID,
     session_id: "sess-past",
-    mode: "conversation",
     cwd: "/tmp/past",
     model: "sonnet",
     status: "completed",
@@ -64,7 +61,6 @@ const PAST = historyItem({});
 const HEADLESS = historyItem({
   id: HEADLESS_ID,
   session_id: "sess-headless",
-  mode: "headless",
   cwd: "/tmp/headless",
   prompt_preview: "the headless prompt",
   started_at: new Date(1000).toISOString(),
@@ -95,10 +91,9 @@ function row(id: string, over: Partial<UnifiedRunRow> = {}): UnifiedRunRow {
   return {
     id,
     sessionId: `sess-${id}`,
-    mode: "conversation",
     cwd: `/tmp/${id}`,
     model: "sonnet",
-    status: "completed",
+    status: "abandoned",
     promptPreview: `prompt of ${id}`,
     startedAt: 1000,
     endedAt: 2000,
@@ -216,39 +211,31 @@ describe("RunsModal", () => {
     expect(spies.onAttach).toHaveBeenCalledWith(LIVE_ID);
   });
 
-  it("fires resume with the history item behind a finished conversation row", () => {
+  it("fires resume with the history item behind a finished row", () => {
     const { spies } = renderModal([row(PAST_ID)]);
     fireEvent.click(screen.getByText(i18n.t("run:resume.resumeOption")));
     expect(spies.onResume).toHaveBeenCalledWith(PAST);
-    expect(spies.onView).not.toHaveBeenCalled();
   });
 
-  it("fires view — not resume — for a finished headless row", () => {
-    const { spies } = renderModal([row(HEADLESS_ID, { mode: "headless" })]);
-    expect(screen.queryByText(i18n.t("run:resume.resumeOption"))).toBeNull();
+  it("fires view for a finished row", () => {
+    const { spies } = renderModal([row(HEADLESS_ID)]);
     fireEvent.click(screen.getByText(i18n.t("run:runs.viewLabel")));
     expect(spies.onView).toHaveBeenCalledWith(HEADLESS);
-    expect(spies.onResume).not.toHaveBeenCalled();
   });
 
-  it("filters by status, by mode and by free text", () => {
+  it("filters by status and by free text", () => {
     const rows = [
       row("a", { status: "running", isLive: true, promptPreview: "alpha" }),
-      row("b", { status: "error", promptPreview: "bravo" }),
-      row("c", { status: "completed", mode: "headless", promptPreview: "charlie" }),
+      row("b", { status: "killed", promptPreview: "bravo" }),
+      row("c", { status: "abandoned", promptPreview: "charlie" }),
     ];
     renderModal(rows);
 
-    fireEvent.click(chip(i18n.t("run:status.error")));
+    fireEvent.click(chip(i18n.t("run:status.killed")));
     expect(screen.getByText("bravo")).toBeTruthy();
     expect(screen.queryByText("alpha")).toBeNull();
 
     fireEvent.click(allChip(0));
-    fireEvent.click(chip(i18n.t("run:mode.headless")));
-    expect(screen.getByText("charlie")).toBeTruthy();
-    expect(screen.queryByText("bravo")).toBeNull();
-
-    fireEvent.click(allChip(1));
     fireEvent.change(
       screen.getByPlaceholderText(
         i18n.t("run:runs.searchPlaceholder", "Search prompt, cwd, model, or session id…")