feat: add theme system, branding, and task logging

- Add light/dark/system theme toggle in settings
- Add DearDiary.io branding in navbar
- Add task logging for journal generation with request/response
- Rename project from TotalRecall to DearDiary
- Update Docker configuration

frontend/src/lib/api.ts

@@ -126,13 +126,21 @@ class ApiClient {
   }
 
   async generateJournal(date: string) {
-    return this.request<Journal>('POST', `/journal/generate/${date}`);
+    return this.request<{ journal: Journal; task: Task }>('POST', `/journal/generate/${date}`);
   }
 
   async getJournal(date: string) {
     return this.request<Journal>('GET', `/journal/${date}`);
   }
 
+  async getJournalTasks(date: string) {
+    return this.request<Task[]>('GET', `/journal/${date}/tasks`);
+  }
+
+  async getTask(taskId: string) {
+    return this.request<Task>('GET', `/tasks/${taskId}`);
+  }
+
   async getSettings() {
     return this.request<Settings>('GET', '/settings');
   }
@@ -160,6 +168,21 @@ export interface Journal {
   generatedAt: string;
 }
 
+export interface Task {
+  id: string;
+  journalId: string;
+  type: string;
+  status: 'pending' | 'completed' | 'failed';
+  provider: string;
+  model?: string;
+  prompt?: string;
+  request?: string;
+  response?: string;
+  error?: string;
+  createdAt: string;
+  completedAt?: string;
+}
+
 export interface Settings {
   aiProvider: 'openai' | 'anthropic' | 'ollama' | 'lmstudio';
   aiApiKey?: string;