feat: Add Grid View and Monthly Summary pages with workday management

- Implement GridView.razor for displaying a tabular view of workdays in the current month.
- Create MonthlySummary.razor to show a summary of worked hours, income, and day types for the selected month.
- Introduce WorkDayEditor.razor for adding and editing workday entries with detailed calculations.
- Update Home.razor to include links to the new Grid View and Monthly Summary pages.
- Add IWorkDayService interface and CouchbaseLiteWorkDayService implementation for managing workday data.
- Define domain models: WorkDayDocument, MonthlySummaryModel, and CoeffSnapshotDocument for data structure.
- Enhance CouchbaseLiteDatabaseProvider to include a collection for workdays.
- Update app settings and services to support new features.
- Add CSS styles for calendar view and table formatting.

wwwroot/app.css

@@ -57,4 +57,47 @@ h1:focus {
 
 .form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
     text-align: start;
+}
+
+/* Calendar view */
+.calendar-table td.calendar-cell {
+    height: 5rem;
+    vertical-align: top;
+    padding: 0.25rem 0.4rem;
+    cursor: pointer;
+    min-width: 5rem;
+}
+
+.calendar-table td.calendar-cell:hover {
+    background-color: rgba(0, 0, 0, 0.05);
+}
+
+.calendar-day-number {
+    font-weight: bold;
+    font-size: 0.9rem;
+}
+
+.calendar-hours {
+    font-size: 0.75rem;
+    color: #666;
+}
+
+.calendar-weekend {
+    background-color: #ffe0e0 !important;
+}
+
+.calendar-closure {
+    background-color: #fff3cd !important;
+}
+
+.calendar-illness {
+    background-color: #d1ecf1 !important;
+}
+
+.calendar-dayoff {
+    background-color: #e2e3e5 !important;
+}
+
+.calendar-holiday {
+    background-color: #d4edda !important;
 }