(Breaking change) Switch between set password and change password on the settings page. (#15582)

Here is what the PR does:

- Surface password state in validatePasswordResetToken, returning
hasPassword so the client can tell whether a user is setting or changing
their password.
- Consume that flag throughout the front end (mock data, stories,
GraphQL types) and update the Reset/Set Password modal to swap the
heading/button label and success toast accordingly.
- After a successful password set/reset, immediately update the
logged-in user’s hasPassword flag so the Settings screen reflects the
new state without a reload.

Modal has two states now - reset password modal uses change password
state since it made intuitive sense.

<p align="center">
<img width="404" height="397" alt="image"
src="https://github.com/user-attachments/assets/c54cc581-1248-4395-833d-0202758e1947"
/>
</p>

<p align="center">
<img width="403" height="393" alt="image"
src="https://github.com/user-attachments/assets/d8a39a95-27e6-4037-86f2-1f74176002ba"
/>
</p>

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-server/src/engine/core-modules/user/user.resolver.ts

@@ -332,6 +332,13 @@ export class UserResolver {
     );
   }
 
+  @ResolveField(() => Boolean, {
+    name: 'hasPassword',
+  })
+  hasPassword(@Parent() user: UserEntity): boolean {
+    return isDefined(user.passwordHash);
+  }
+
   @ResolveField(() => String, {
     nullable: true,
   })