Implements FilterTemplate system for event matching

Introduces flexible key-based filtering for calendar events across different view configurations

Adds new FilterTemplate class to:
- Define event matching rules based on view configuration
- Support multi-level grouping (team/resource/date)
- Handle dynamic key generation for columns and events

Enhances view configuration with explicit id properties and derived fields

src/v2/core/DateService.ts

@@ -11,9 +11,26 @@ dayjs.extend(isoWeek);
 
 export class DateService {
   private timezone: string;
+  private baseDate: dayjs.Dayjs;
 
-  constructor(private config: ITimeFormatConfig) {
+  constructor(private config: ITimeFormatConfig, baseDate?: Date) {
     this.timezone = config.timezone;
+    // Allow setting a fixed base date for demo/testing purposes
+    this.baseDate = baseDate ? dayjs(baseDate) : dayjs();
+  }
+
+  /**
+   * Set a fixed base date (useful for demos with static mock data)
+   */
+  setBaseDate(date: Date): void {
+    this.baseDate = dayjs(date);
+  }
+
+  /**
+   * Get the current base date (either fixed or today)
+   */
+  getBaseDate(): Date {
+    return this.baseDate.toDate();
   }
 
   parseISO(isoString: string): Date {
@@ -25,7 +42,7 @@ export class DateService {
   }
 
   getWeekDates(offset = 0, days = 7): string[] {
-    const monday = dayjs().startOf('week').add(1, 'day').add(offset, 'week');
+    const monday = this.baseDate.startOf('week').add(1, 'day').add(offset, 'week');
     return Array.from({ length: days }, (_, i) =>
       monday.add(i, 'day').format('YYYY-MM-DD')
     );