feat(workspace): the console tab bar is the session view's only header

The status/name/back-arrow row is gone; Tools sits at the tab bar's right
end and the pipeline/feature pickers show only with a template.
LaneConsolePane is reduced to the terminal (no title, no Active runs, no
New run): RunHistory.tsx, api.run.history and the page's active-sessions
poll are removed.

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

@@ -1,15 +1,13 @@
 {
   "emptyPane": "No session in this pane. Start one from the workspace's prompt box.",
   "actions": {
-    "newRun": "New run",
     "newSession": "New session",
     "send": "Send",
     "sending": "Sending…",
     "start": "Run",
     "starting": "Starting…",
     "stop": "Stop",
-    "stopping": "Stopping…",
-    "viewSession": "View session"
+    "stopping": "Stopping…"
   },
   "autocomplete": {
     "fileHint": "Type @ to reference a file",
@@ -36,15 +34,11 @@
   },
   "errors": {
     "attachFailed": "Couldn't attach to run: {{message}}",
-    "attachedToLiveInstead": "This workspace's previous session is still running, so nothing new could start — attached to it instead. Kill it from Active runs to start fresh.",
     "cwdRequired": "Working directory required to start a run",
-    "killFailed": "Couldn't stop: {{message}}",
     "laneCreateFailed": "Failed to create workspace: {{message}}",
     "noLaneSelected": "No workspace selected or could not create one",
-    "noRunIdReturned": "No run_id returned from workspace start",
     "runStartedButNotAttached": "Run is live but couldn't attach to console: {{message}}",
-    "sendFailed": "Couldn't send: {{message}}",
-    "startFailed": "Couldn't start run: {{message}}"
+    "sendFailed": "Couldn't send: {{message}}"
   },
   "events": {
     "claude": "Claude",
@@ -110,9 +104,6 @@
     "sandboxWarning": "Codex will run commands with no sandbox.",
     "shortcut": "Enter to send · Shift+Enter for newline"
   },
-  "limitations": {
-    "dismiss": "Got it"
-  },
   "mode": {
     "conversation": "Conversation",
     "conversationHint": "Multi-turn - keep typing follow-ups while the agent works.",
@@ -131,32 +122,9 @@
     "pickSession": "Pick a session…",
     "preview": "Last activity",
     "resumeHint": "Pick a session from your history and continue the conversation. Cwd is locked to the original.",
-    "resumeOption": "Resume existing session",
     "search": "Search by ID, cwd, or status…",
     "selectedBadge": "Resuming"
   },
-  "runs": {
-    "allSessionsLink": "See all Claude Code sessions →",
-    "attached": "Attached to existing run",
-    "externalBadge": "external",
-    "externalHint": "Started outside the dashboard, so there is no terminal to attach to. Resume opens a new tmux-backed `claude --resume` of this session in its folder.",
-    "scopeNote": "Runs started from this dashboard, plus Claude Code sessions running outside it.",
-    "started": "Started {{when}}",
-    "switcher": "Active runs",
-    "switcherEmpty": "No active runs",
-    "viewActive": "View active run",
-    "viewActive_other": "{{count}} active runs",
-    "viewLabel": "View"
-  },
-  "status": {
-    "abandoned": "Abandoned",
-    "completed": "Completed",
-    "error": "Error",
-    "idle": "Idle",
-    "killed": "Killed",
-    "running": "Running",
-    "spawning": "Spawning…"
-  },
   "statusHeader": {
     "cwd": "Cwd",
     "duration": "Elapsed",
@@ -166,8 +134,6 @@
     "permissionMode": "Mode",
     "session": "Session"
   },
-  "subtitle": "Streamed output, multi-turn, same hooks and analytics as your terminal.",
-  "title": "Run {{tool}}",
   "tokens": {
     "cacheRead": "Cache hit",
     "cost": "Cost",