feat(gtm): add session history, database loading, and markdown file import

gtm-architect/types.ts

@@ -108,7 +108,7 @@ export interface AppState {
   phase2Result?: Phase2Data;
   phase3Result?: Phase3Data;
   phase4Result?: Phase4Data;
-  phase5Result?: string; // Markdown content
+  phase5Result?: { report: string }; // Markdown content wrapped in object
   phase6Result?: Phase6Data;
   phase7Result?: Phase7Data;
   phase8Result?: Phase8Data;
@@ -116,4 +116,12 @@ export interface AppState {
   translatedReport?: string; // New field for the English translation
   language: Language;
   theme: Theme;
+  projectId?: string; // Current Project ID
+}
+
+export interface ProjectHistoryItem {
+    id: string;
+    name: string;
+    created_at: string;
+    updated_at: string;
 }