feat(v3): implement Mission Control MVP (Phases 1-5)

Phase 1: Data model - groups.rs (Rust structs + load/save groups.json),
groups.ts (TypeScript interfaces), groups-bridge.ts (IPC adapter),
workspace.svelte.ts (replaces layout store), SQLite migrations
(agent_messages, project_agent_state tables, project_id column),
--group CLI argument.

Phase 2: Project shell layout - GlobalTabBar, ProjectGrid, ProjectBox,
ProjectHeader, CommandPalette, DocsTab, ContextTab, SettingsTab,
App.svelte full rewrite (no sidebar/TilingGrid).

Phase 3: ClaudeSession.svelte wrapping AgentPane per-project.
Phase 4: TerminalTabs.svelte with shell/SSH/agent tab types.
Phase 5: TeamAgentsPanel + AgentCard for compact subagent view.

Also fixes AgentPane Svelte 5 event modifier (on:click -> onclick).

v2/src/lib/adapters/groups-bridge.ts

@@ -0,0 +1,85 @@
+import { invoke } from '@tauri-apps/api/core';
+import type { GroupsFile, ProjectConfig, GroupConfig } from '../types/groups';
+
+export type { GroupsFile, ProjectConfig, GroupConfig };
+
+export interface MdFileEntry {
+  name: string;
+  path: string;
+  priority: boolean;
+}
+
+export interface AgentMessageRecord {
+  id: number;
+  session_id: string;
+  project_id: string;
+  sdk_session_id: string | null;
+  message_type: string;
+  content: string;
+  parent_id: string | null;
+  created_at: number;
+}
+
+export interface ProjectAgentState {
+  project_id: string;
+  last_session_id: string;
+  sdk_session_id: string | null;
+  status: string;
+  cost_usd: number;
+  input_tokens: number;
+  output_tokens: number;
+  last_prompt: string | null;
+  updated_at: number;
+}
+
+// --- Group config ---
+
+export async function loadGroups(): Promise<GroupsFile> {
+  return invoke('groups_load');
+}
+
+export async function saveGroups(config: GroupsFile): Promise<void> {
+  return invoke('groups_save', { config });
+}
+
+// --- Markdown discovery ---
+
+export async function discoverMarkdownFiles(cwd: string): Promise<MdFileEntry[]> {
+  return invoke('discover_markdown_files', { cwd });
+}
+
+// --- Agent message persistence ---
+
+export async function saveAgentMessages(
+  sessionId: string,
+  projectId: string,
+  sdkSessionId: string | undefined,
+  messages: AgentMessageRecord[],
+): Promise<void> {
+  return invoke('agent_messages_save', {
+    sessionId,
+    projectId,
+    sdkSessionId: sdkSessionId ?? null,
+    messages,
+  });
+}
+
+export async function loadAgentMessages(projectId: string): Promise<AgentMessageRecord[]> {
+  return invoke('agent_messages_load', { projectId });
+}
+
+// --- Project agent state ---
+
+export async function saveProjectAgentState(state: ProjectAgentState): Promise<void> {
+  return invoke('project_agent_state_save', { state });
+}
+
+export async function loadProjectAgentState(projectId: string): Promise<ProjectAgentState | null> {
+  return invoke('project_agent_state_load', { projectId });
+}
+
+// --- CLI arguments ---
+
+export async function getCliGroup(): Promise<string | null> {
+  return invoke('cli_get_group');
+}