Add profile management features

- Introduced profile update and password change functionalities in main.py.
- Added new ProfileUpdate and PasswordChange schemas in user.py.
- Updated base.html to include a profile link in the navigation and modified user chip for better accessibility.
- Enhanced CSS for user chip links to improve UI interaction.

app/schemas/user.py

@@ -8,6 +8,15 @@ class UserCreate(BaseModel):
     role: str = Field(default="reader", pattern="^(admin|editor|reader)$")
 
 
+class ProfileUpdate(BaseModel):
+    email: EmailStr
+    full_name: str = Field(min_length=2, max_length=255)
+
+
+class PasswordChange(BaseModel):
+    new_password: str = Field(min_length=10, max_length=255)
+
+
 class UserOut(BaseModel):
     id: int
     email: EmailStr