Refactor calendar navigation with flexible day offsets

Improves date navigation by introducing dynamic period-based offsets for calendar views

Replaces week-based navigation with more flexible day offsets that support:
- Single-day and multi-day navigation
- Configurable work week presets with different period lengths
- More granular control over date range selection

Adds support for dynamic navigation periods through workweek preset configuration

wwwroot/data/tenant-settings.json

@@ -6,27 +6,38 @@
       "standard": {
         "id": "standard",
         "workDays": [1, 2, 3, 4, 5],
-        "label": "Man-Fre"
+        "label": "Man-Fre",
+        "periodDays": 7
       },
       "compressed": {
         "id": "compressed",
         "workDays": [1, 2, 3],
-        "label": "Man-Ons"
+        "label": "Man-Ons",
+        "periodDays": 7
       },
       "midweek": {
         "id": "midweek",
         "workDays": [4, 5],
-        "label": "Tors-Fre"
+        "label": "Tors-Fre",
+        "periodDays": 7
       },
       "weekend": {
         "id": "weekend",
         "workDays": [6, 7],
-        "label": "Weekend"
+        "label": "Weekend",
+        "periodDays": 7
       },
       "fullweek": {
         "id": "fullweek",
         "workDays": [1, 2, 3, 4, 5, 6, 7],
-        "label": "Alle dage"
+        "label": "Alle dage",
+        "periodDays": 7
+      },
+      "day": {
+        "id": "day",
+        "workDays": [1],
+        "label": "Dag",
+        "periodDays": 1
       }
     },
     "defaultPreset": "standard",