Feature/improve usability of fire calculator (#1779)

* Improve usability

* Add debounce
* Persist annualInterestRate
* Partially disable date picker

* Update changelog

libs/common/src/lib/interfaces/user-settings.interface.ts

@@ -1,6 +1,7 @@
 import { ColorScheme, DateRange, ViewMode } from '@ghostfolio/common/types';
 
 export interface UserSettings {
+  annualInterestRate?: number;
   baseCurrency?: string;
   benchmark?: string;
   colorScheme?: ColorScheme;