Fix provider logos, improve Fetch button UX on mail accounts page

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/058b6481-f8eb-43ed-8f5f-715c19c4a377

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

backend/app/api/v1/endpoints/mail_accounts.py

@@ -104,6 +104,7 @@ async def create_mail_account(
         check_interval_minutes=account_in.check_interval_minutes,
         max_emails_per_check=account_in.max_emails_per_check,
         delete_after_forward=account_in.delete_after_forward,
+        provider_name=account_in.provider_name,
     )
 
     db.add(account)

backend/app/models/schemas.py

@@ -113,6 +113,7 @@ class MailAccountBase(BaseModel):
     check_interval_minutes: int = Field(default=5, gt=0, le=1440)
     max_emails_per_check: int = Field(default=50, gt=0, le=1000)
     delete_after_forward: bool = True
+    provider_name: Optional[str] = Field(None, max_length=100)
 
 
 class MailAccountCreate(MailAccountBase):
@@ -135,6 +136,7 @@ class MailAccountUpdate(BaseModel):
     check_interval_minutes: Optional[int] = Field(None, gt=0, le=1440)
     max_emails_per_check: Optional[int] = Field(None, gt=0, le=1000)
     delete_after_forward: Optional[bool] = None
+    provider_name: Optional[str] = Field(None, max_length=100)
 
 
 class MailAccountResponse(MailAccountBase):