feat(web): workspace components — ComparePane, Memory page, McpDialog, error boundaries, message-parts

- Add ComparePane.tsx: side-by-side AI response comparison
- Add Memory.tsx: memory management page with CRUD UI
- Add McpPermissionDialog.tsx: MCP tool permission approval dialog
- Add McpResponseDisplay.tsx: MCP response visualization
- Add MessageBoundary.tsx + MessageListErrorBoundary.tsx: error resilience
- Add EmptyState.tsx: contextual empty state component
- Add KeyboardShortcutsDialog.tsx: keyboard shortcut reference
- Add message-parts/: ActionRow, CompactCard, MistakeRecoverySentinel, ReasoningBlock, SendToTerminalMenu, StatsLine, SummaryCard
- Add useDraftPersistence.ts: draft message persistence hook
- Add useTerminals.ts: terminal session management hook
- Add keyboard-shortcuts.ts + tool-utils.ts: shared utilities
- Extend components: ChatInput, MessageBubble, MessageList, Workspace, panes
- Extend hooks: useTerminalSocket, useSessionStream test suite
- Update pages: Home, Project — workspace layout and session flow

apps/web/src/lib/tool-utils.ts

@@ -0,0 +1,49 @@
+// Set of built-in tool names (from formatToolArgs in ToolCallLine.tsx).
+// Any tool not in this set that has a `server_tool` name pattern is an MCP tool.
+export const BUILT_IN_TOOLS = new Set([
+  'view_file',
+  'list_dir',
+  'grep',
+  'find_files',
+  'git_status',
+  'skill_use',
+  'get_codebase_overview',
+  'get_file_analysis',
+  'get_symbol_info',
+  'search_symbols',
+  'get_dependencies',
+  'watch_changes',
+  'get_semantic_neighborhoods',
+  'get_framework_analysis',
+]);
+
+/**
+ * Returns true if the tool name follows the `<server>_<tool>` MCP pattern.
+ * Built-in tools (view_file, grep, skill_use, etc.) are excluded even if
+ * they happen to contain an underscore (e.g. 'git_status', 'skill_use').
+ */
+export function isMcpTool(name: string): boolean {
+  return name.includes('_') && !BUILT_IN_TOOLS.has(name);
+}
+
+/**
+ * Extracts the MCP server name from a tool call name.
+ * For 'context7_searchWeb' returns 'context7'.
+ * Returns null for native tools.
+ */
+export function extractServerName(name: string): string | null {
+  const idx = name.indexOf('_');
+  if (idx === -1) return null;
+  return name.slice(0, idx);
+}
+
+/**
+ * Extracts the tool name (without server prefix) from an MCP tool call name.
+ * For 'context7_searchWeb' returns 'searchWeb'.
+ * Returns null for native tools.
+ */
+export function extractToolName(name: string): string | null {
+  const idx = name.indexOf('_');
+  if (idx === -1) return null;
+  return name.slice(idx + 1);
+}