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/i18n/locales/en/run.json

@@ -74,7 +74,8 @@
     "permissionMode": "Permission mode",
     "permissionPlan": "plan (read-only planning)",
     "prompt": "Prompt",
-    "promptPlaceholder": "Ask Claude anything…"
+    "promptPlaceholder": "Ask Claude anything…",
+    "promptPlaceholderTerminal": "Ask Claude anything…"
   },
   "footer": {
     "cost": "Cost",

client/src/i18n/locales/vi/run.json

@@ -73,7 +73,8 @@
     "permissionMode": "Permission mode",
     "permissionPlan": "plan (chỉ đọc, lập kế hoạch)",
     "prompt": "Prompt",
-    "promptPlaceholder": "Hỏi Claude bất cứ điều gì…"
+    "promptPlaceholder": "Hỏi Claude bất cứ điều gì…",
+    "promptPlaceholderTerminal": "Hỏi Claude bất cứ điều gì…"
   },
   "footer": {
     "cost": "Chi phí",