Fix: Use named imports for tsdav field updater functions

Changed from default import to named imports for:
- updateEventFields (update-event-fields.js)
- updateVCardFields (update-contact-fields.js)
- updateTodoFields (update-todo-fields.js)

The functions are exported as named exports by tsdav, not as part of
the default export. This was causing "is not a function" errors at runtime.

Also removed unnecessary type checking in update-event-fields.js since
the function is now guaranteed to be imported correctly.

Author: PhilflowIO

src/tools/calendar/update-event-fields.js

@@ -2,8 +2,7 @@ import { tsdavManager } from '../../tsdav-client.js';
 import { validateInput } from '../../validation.js';
 import { formatSuccess, formatError } from '../../formatters.js';
 import { z } from 'zod';
-import tsdavPkg from 'tsdav';
-const tsdavUpdateEventFields = tsdavPkg.updateEventFields;
+import { updateEventFields as tsdavUpdateEventFields } from 'tsdav';
 
 /**
  * Schema for field-based event updates
@@ -93,9 +92,6 @@ export const updateEventFields = {
       }
 
       // Step 3: Use tsdav's native updateEventFields function
-      if (typeof tsdavUpdateEventFields !== 'function') {
-        throw new Error(`tsdavUpdateEventFields is not a function. Type: ${typeof tsdavUpdateEventFields}`);
-      }
       const result = tsdavUpdateEventFields(calendarObject, tsdavFields);
 
       // Step 4: Send the updated event back to server

src/tools/contacts/update-contact-fields.js

@@ -2,8 +2,7 @@ import { tsdavManager } from '../../tsdav-client.js';
 import { validateInput } from '../../validation.js';
 import { formatSuccess, formatError } from '../../formatters.js';
 import { z } from 'zod';
-import tsdavPkg from 'tsdav';
-const tsdavUpdateVCardFields = tsdavPkg.updateVCardFields;
+import { updateVCardFields as tsdavUpdateVCardFields } from 'tsdav';
 
 /**
  * Schema for field-based vCard updates

src/tools/todos/update-todo-fields.js

@@ -2,8 +2,7 @@ import { tsdavManager } from '../../tsdav-client.js';
 import { validateInput } from '../../validation.js';
 import { formatSuccess, formatError } from '../../formatters.js';
 import { z } from 'zod';
-import tsdavPkg from 'tsdav';
-const tsdavUpdateTodoFields = tsdavPkg.updateTodoFields;
+import { updateTodoFields as tsdavUpdateTodoFields } from 'tsdav';
 
 /**
  * Schema for field-based todo updates