feat(v3): implement session continuity, workspace teardown, StatusBar rewrite, subagent routing fix

P6: persistSessionForProject() saves agent state + messages to SQLite on
session complete. registerSessionProject() maps sessionId -> projectId.
ClaudeSession restoreMessagesFromRecords() restores cached messages on mount.

P7: clearAllAgentSessions() clears sessions on group switch. switchGroup()
calls clearAllAgentSessions() + resets terminal tabs.

P10: StatusBar rewritten for workspace store (group name, project count,
agent count, "BTerminal v3"). Subagent routing fixed: project-scoped
sessions skip layout pane creation (render in TeamAgentsPanel instead).

v2/src/lib/agent-dispatcher.ts

@@ -11,15 +11,28 @@ import {
   appendAgentMessages,
   updateAgentCost,
   getAgentSessions,
+  getAgentSession,
   createAgentSession,
   findChildByToolUseId,
 } from './stores/agents.svelte';
 import { addPane, getPanes } from './stores/layout.svelte';
 import { notify } from './stores/notifications.svelte';
+import {
+  saveProjectAgentState,
+  saveAgentMessages,
+  type AgentMessageRecord,
+} from './adapters/groups-bridge';
 
 let unlistenMsg: (() => void) | null = null;
 let unlistenExit: (() => void) | null = null;
 
+// Map sessionId -> projectId for persistence routing
+const sessionProjectMap = new Map<string, string>();
+
+export function registerSessionProject(sessionId: string, projectId: string): void {
+  sessionProjectMap.set(sessionId, projectId);
+}
+
 // Sidecar liveness — checked by UI components
 let sidecarAlive = true;
 
@@ -160,6 +173,8 @@ function handleAgentEvent(sessionId: string, event: Record<string, unknown>): vo
           updateAgentStatus(sessionId, 'done');
           notify('success', `Agent done — $${cost.totalCostUsd.toFixed(4)}, ${cost.numTurns} turns`);
         }
+        // Persist session state for project-scoped sessions
+        persistSessionForProject(sessionId);
         break;
       }
     }
@@ -220,15 +235,60 @@ function spawnSubagentPane(parentSessionId: string, tc: ToolCallContent): void {
   });
   updateAgentStatus(childId, 'running');
 
-  // Create layout pane, auto-grouped under parent's title
-  const parentPane = getPanes().find(p => p.id === parentSessionId);
-  const groupName = parentPane?.title ?? `Agent ${parentSessionId.slice(0, 8)}`;
-  addPane({
-    id: childId,
-    type: 'agent',
-    title: `Sub: ${label}`,
-    group: groupName,
-  });
+  // For project-scoped sessions, subagents render in TeamAgentsPanel (no layout pane)
+  // For non-project sessions (detached mode), create a layout pane
+  if (!sessionProjectMap.has(parentSessionId)) {
+    const parentPane = getPanes().find(p => p.id === parentSessionId);
+    const groupName = parentPane?.title ?? `Agent ${parentSessionId.slice(0, 8)}`;
+    addPane({
+      id: childId,
+      type: 'agent',
+      title: `Sub: ${label}`,
+      group: groupName,
+    });
+  }
+}
+
+/** Persist session state + messages to SQLite for the project that owns this session */
+async function persistSessionForProject(sessionId: string): Promise<void> {
+  const projectId = sessionProjectMap.get(sessionId);
+  if (!projectId) return; // Not a project-scoped session
+
+  const session = getAgentSession(sessionId);
+  if (!session) return;
+
+  try {
+    // Save agent state
+    await saveProjectAgentState({
+      project_id: projectId,
+      last_session_id: sessionId,
+      sdk_session_id: session.sdkSessionId ?? null,
+      status: session.status,
+      cost_usd: session.costUsd,
+      input_tokens: session.inputTokens,
+      output_tokens: session.outputTokens,
+      last_prompt: session.prompt,
+      updated_at: Date.now(),
+    });
+
+    // Save messages
+    const records: AgentMessageRecord[] = session.messages.map((m, i) => ({
+      id: i,
+      session_id: sessionId,
+      project_id: projectId,
+      sdk_session_id: session.sdkSessionId ?? null,
+      message_type: m.type,
+      content: JSON.stringify(m.content),
+      parent_id: m.parentId ?? null,
+      created_at: Date.now(),
+    }));
+
+    if (records.length > 0) {
+      await saveAgentMessages(sessionId, projectId, session.sdkSessionId, records);
+    }
+  } catch (e) {
+    console.warn('Failed to persist agent session:', e);
+  }
 }
 
 export function stopAgentDispatcher(): void {

v2/src/lib/components/StatusBar/StatusBar.svelte

@@ -1,22 +1,27 @@
 <script lang="ts">
-  import { getPanes } from '../../stores/layout.svelte';
   import { getAgentSessions } from '../../stores/agents.svelte';
+  import { getActiveGroup, getEnabledProjects, getActiveGroupId } from '../../stores/workspace.svelte';
 
-  let panes = $derived(getPanes());
   let agentSessions = $derived(getAgentSessions());
+  let activeGroup = $derived(getActiveGroup());
+  let enabledProjects = $derived(getEnabledProjects());
 
   let activeAgents = $derived(agentSessions.filter(s => s.status === 'running' || s.status === 'starting').length);
   let totalCost = $derived(agentSessions.reduce((sum, s) => sum + s.costUsd, 0));
   let totalTokens = $derived(agentSessions.reduce((sum, s) => sum + s.inputTokens + s.outputTokens, 0));
-  let terminalCount = $derived(panes.filter(p => p.type === 'terminal').length);
-  let agentCount = $derived(panes.filter(p => p.type === 'agent').length);
+  let projectCount = $derived(enabledProjects.length);
+  let agentCount = $derived(agentSessions.length);
 </script>
 
 <div class="status-bar">
   <div class="left">
-    <span class="item" title="Terminal panes">{terminalCount} terminals</span>
+    {#if activeGroup}
+      <span class="item group-name" title="Active group">{activeGroup.name}</span>
+      <span class="sep"></span>
+    {/if}
+    <span class="item" title="Enabled projects">{projectCount} projects</span>
     <span class="sep"></span>
-    <span class="item" title="Agent panes">{agentCount} agents</span>
+    <span class="item" title="Agent sessions">{agentCount} agents</span>
     {#if activeAgents > 0}
       <span class="sep"></span>
       <span class="item active">
@@ -34,24 +39,24 @@
       <span class="item cost">${totalCost.toFixed(4)}</span>
       <span class="sep"></span>
     {/if}
-    <span class="item version">BTerminal v2</span>
+    <span class="item version">BTerminal v3</span>
   </div>
 </div>
 
 <style>
   .status-bar {
-    grid-column: 1 / -1;
     display: flex;
     align-items: center;
     justify-content: space-between;
     height: 24px;
     padding: 0 10px;
-    background: var(--bg-secondary);
-    border-top: 1px solid var(--border);
+    background: var(--ctp-mantle);
+    border-top: 1px solid var(--ctp-surface0);
     font-size: 11px;
-    color: var(--text-muted);
-    font-family: var(--font-mono);
+    color: var(--ctp-overlay1);
+    font-family: 'JetBrains Mono', monospace;
     user-select: none;
+    flex-shrink: 0;
   }
 
   .left, .right {
@@ -63,7 +68,7 @@
   .sep {
     width: 1px;
     height: 10px;
-    background: var(--border);
+    background: var(--ctp-surface1);
   }
 
   .item {
@@ -72,6 +77,11 @@
     gap: 4px;
   }
 
+  .group-name {
+    color: var(--ctp-blue);
+    font-weight: 600;
+  }
+
   .active {
     color: var(--ctp-blue);
   }

v2/src/lib/components/Workspace/ClaudeSession.svelte

@@ -1,14 +1,21 @@
 <script lang="ts">
-  import { onMount } from 'svelte';
   import type { ProjectConfig } from '../../types/groups';
   import {
     loadProjectAgentState,
-    saveProjectAgentState,
     loadAgentMessages,
-    saveAgentMessages,
     type ProjectAgentState,
     type AgentMessageRecord,
   } from '../../adapters/groups-bridge';
+  import { registerSessionProject } from '../../agent-dispatcher';
+  import {
+    createAgentSession,
+    appendAgentMessages,
+    updateAgentCost,
+    updateAgentStatus,
+    setAgentSdkSessionId,
+    getAgentSession,
+  } from '../../stores/agents.svelte';
+  import type { AgentMessage } from '../../adapters/sdk-messages';
   import AgentPane from '../Agent/AgentPane.svelte';
 
   interface Props {
@@ -18,11 +25,10 @@
 
   let { project, onsessionid }: Props = $props();
 
-  // Per-project session ID (stable across renders, changes with project)
   let sessionId = $state(crypto.randomUUID());
   let lastState = $state<ProjectAgentState | null>(null);
-  let resumeSessionId = $state<string | undefined>(undefined);
   let loading = $state(true);
+  let hasRestoredHistory = $state(false);
 
   // Load previous session state when project changes
   $effect(() => {
@@ -32,14 +38,20 @@
 
   async function loadPreviousState(projectId: string) {
     loading = true;
+    hasRestoredHistory = false;
     try {
       const state = await loadProjectAgentState(projectId);
       lastState = state;
-      if (state?.sdk_session_id) {
-        resumeSessionId = state.sdk_session_id;
+      if (state?.last_session_id) {
         sessionId = state.last_session_id;
+
+        // Restore cached messages into the agent store
+        const records = await loadAgentMessages(projectId);
+        if (records.length > 0) {
+          restoreMessagesFromRecords(sessionId, state, records);
+          hasRestoredHistory = true;
+        }
       } else {
-        resumeSessionId = undefined;
         sessionId = crypto.randomUUID();
       }
     } catch (e) {
@@ -47,9 +59,45 @@
       sessionId = crypto.randomUUID();
     } finally {
       loading = false;
+      // Register session -> project mapping for persistence
+      registerSessionProject(sessionId, project.id);
       onsessionid?.(sessionId);
     }
   }
+
+  function restoreMessagesFromRecords(
+    sid: string,
+    state: ProjectAgentState,
+    records: AgentMessageRecord[],
+  ) {
+    // Don't re-create if already exists
+    if (getAgentSession(sid)) return;
+
+    createAgentSession(sid, state.last_prompt ?? '');
+    if (state.sdk_session_id) {
+      setAgentSdkSessionId(sid, state.sdk_session_id);
+    }
+
+    // Convert records back to AgentMessage format
+    const messages: AgentMessage[] = records.map(r => ({
+      id: `restored-${r.id}`,
+      type: r.message_type as AgentMessage['type'],
+      content: JSON.parse(r.content),
+      parentId: r.parent_id ?? undefined,
+    }));
+
+    appendAgentMessages(sid, messages);
+    updateAgentCost(sid, {
+      costUsd: state.cost_usd,
+      inputTokens: state.input_tokens,
+      outputTokens: state.output_tokens,
+      numTurns: 0,
+      durationMs: 0,
+    });
+
+    // Mark as done (it's a restored completed session)
+    updateAgentStatus(sid, state.status === 'error' ? 'error' : 'done');
+  }
 </script>
 
 <div class="claude-session">
@@ -69,6 +117,7 @@
     overflow: hidden;
     display: flex;
     flex-direction: column;
+    flex: 1;
   }
 
   .loading-state {

v2/src/lib/stores/agents.svelte.ts

@@ -130,6 +130,10 @@ export function getTotalCost(id: string): { costUsd: number; inputTokens: number
   return { costUsd, inputTokens, outputTokens };
 }
 
+export function clearAllAgentSessions(): void {
+  sessions = [];
+}
+
 export function removeAgentSession(id: string): void {
   // Also remove from parent's childSessionIds
   const session = sessions.find(s => s.id === id);

v2/src/lib/stores/workspace.svelte.ts

@@ -1,5 +1,6 @@
 import { loadGroups, saveGroups, getCliGroup } from '../adapters/groups-bridge';
 import type { GroupsFile, GroupConfig, ProjectConfig } from '../types/groups';
+import { clearAllAgentSessions } from '../stores/agents.svelte';
 
 export type WorkspaceTab = 'sessions' | 'docs' | 'context' | 'settings';
 
@@ -66,8 +67,9 @@ export function setActiveProject(projectId: string | null): void {
 export async function switchGroup(groupId: string): Promise<void> {
   if (groupId === activeGroupId) return;
 
-  // Clear terminal tabs for the old group
+  // Teardown: clear terminal tabs and agent sessions for the old group
   projectTerminals = new Map();
+  clearAllAgentSessions();
 
   activeGroupId = groupId;
   activeProjectId = null;