Feature - Add support for a fiscal year period defined in user settings.

* Add "This fiscal year", "Last fiscal year" as date range options in Transaction Details to filter transactions to those periods
* Add fiscal year ranges to Statistics & Trend Analysis
* Add "fiscal year start date" to user profile settings, allowing the user to select any date of the calendar year as the start of the fiscal year
* Add "fiscal year format" to user profile settings, allowing the user to specify how financial year date labels should appear

Implementation notes:
* The default fiscal year start is January 1 and the default fiscal year display format is "FY 2025"
* Fiscal year start date (month number & day number) are stored together in db as a uint16, high byte & low byte respectively
* February 29 is disallowed as a fiscal year start date, since it is never used as a convention in any country
* Jest is added to the project as a dev dependency, for unit tests in frontend

Signed-off-by: Sebastian Reategui <seb.reategui@gmail.com>

src/stores/user.ts

@@ -66,6 +66,11 @@ export const useUserStore = defineStore('user', () => {
         return isNumber(userInfo.firstDayOfWeek) && WeekDay.valueOf(userInfo.firstDayOfWeek) ? userInfo.firstDayOfWeek : settingsStore.localeDefaultSettings.firstDayOfWeek;
     });
 
+    const currentUserFiscalYearStart = computed<number>(() => {
+        const userInfo = currentUserBasicInfo.value || EMPTY_USER_BASIC_INFO;
+        return userInfo.fiscalYearStart;
+    });
+
     const currentUserLongDateFormat = computed<number>(() => {
         const userInfo = currentUserBasicInfo.value || EMPTY_USER_BASIC_INFO;
         return userInfo.longDateFormat;
@@ -86,6 +91,11 @@ export const useUserStore = defineStore('user', () => {
         return userInfo.shortTimeFormat;
     });
 
+    const currentUserFiscalYearFormat = computed<number>(() => {
+        const userInfo = currentUserBasicInfo.value || EMPTY_USER_BASIC_INFO;
+        return userInfo.fiscalYearFormat;
+    });
+
     const currentUserDecimalSeparator = computed<number>(() => {
         const userInfo = currentUserBasicInfo.value || EMPTY_USER_BASIC_INFO;
         return userInfo.decimalSeparator;
@@ -321,10 +331,12 @@ export const useUserStore = defineStore('user', () => {
         currentUserLanguage,
         currentUserDefaultCurrency,
         currentUserFirstDayOfWeek,
+        currentUserFiscalYearStart,
         currentUserLongDateFormat,
         currentUserShortDateFormat,
         currentUserLongTimeFormat,
         currentUserShortTimeFormat,
+        currentUserFiscalYearFormat,
         currentUserDecimalSeparator,
         currentUserDigitGroupingSymbol,
         currentUserDigitGrouping,