feat: add EditEventScreen with calendar and chat mode support

Add a unified event editor that works in two modes:
- Calendar mode: Create/edit events directly via EventService API
- Chat mode: Edit AI-proposed events before confirming them

The chat mode allows users to modify proposed events (title, time,
recurrence) and persists changes both locally and to the server.

New components: DateTimePicker, ScrollableDropdown, useDropdownPosition
New API: PUT /api/chat/messages/:messageId/proposal

apps/server/src/ai/utils/toolDefinitions.ts

@@ -94,10 +94,6 @@ export const TOOL_DEFINITIONS: ToolDefinition[] = [
           type: "string",
           description: "Optional event description",
         },
-        isRecurring: {
-          type: "boolean",
-          description: "Whether this is a recurring event",
-        },
         recurrenceRule: {
           type: "string",
           description: "RRULE format string for recurring events",
@@ -133,10 +129,6 @@ export const TOOL_DEFINITIONS: ToolDefinition[] = [
           type: "string",
           description: "New description (optional). NEVER put RRULE here!",
         },
-        isRecurring: {
-          type: "boolean",
-          description: "Whether this is a recurring event (optional)",
-        },
         recurrenceRule: {
           type: "string",
           description:

apps/server/src/ai/utils/toolExecutor.ts

@@ -57,7 +57,6 @@ export function executeToolCall(
         startTime: new Date(args.startTime as string),
         endTime: new Date(args.endTime as string),
         description: args.description as string | undefined,
-        isRecurring: args.isRecurring as boolean | undefined,
         recurrenceRule: args.recurrenceRule as string | undefined,
       };
       const dateStr = formatDate(event.startTime);
@@ -88,8 +87,6 @@ export function executeToolCall(
         updates.startTime = new Date(args.startTime as string);
       if (args.endTime) updates.endTime = new Date(args.endTime as string);
       if (args.description) updates.description = args.description;
-      if (args.isRecurring !== undefined)
-        updates.isRecurring = args.isRecurring;
       if (args.recurrenceRule) updates.recurrenceRule = args.recurrenceRule;
 
       // Build event object for display (merge existing with updates)
@@ -99,8 +96,6 @@ export function executeToolCall(
         endTime: (updates.endTime as Date) || existingEvent.endTime,
         description:
           (updates.description as string) || existingEvent.description,
-        isRecurring:
-          (updates.isRecurring as boolean) ?? existingEvent.isRecurring,
         recurrenceRule:
           (updates.recurrenceRule as string) || existingEvent.recurrenceRule,
         exceptionDates: existingEvent.exceptionDates,
@@ -131,7 +126,7 @@ export function executeToolCall(
 
       // Build descriptive content based on delete mode
       let modeDescription = "";
-      if (existingEvent.isRecurring) {
+      if (existingEvent.recurrenceRule) {
         switch (deleteMode) {
           case "single":
             modeDescription = " (nur dieses Vorkommen)";
@@ -155,12 +150,11 @@ export function executeToolCall(
             startTime: existingEvent.startTime,
             endTime: existingEvent.endTime,
             description: existingEvent.description,
-            isRecurring: existingEvent.isRecurring,
             recurrenceRule: existingEvent.recurrenceRule,
             exceptionDates: existingEvent.exceptionDates,
           },
-          deleteMode: existingEvent.isRecurring ? deleteMode : undefined,
-          occurrenceDate: existingEvent.isRecurring
+          deleteMode: existingEvent.recurrenceRule ? deleteMode : undefined,
+          occurrenceDate: existingEvent.recurrenceRule
             ? occurrenceDate
             : undefined,
         },