Throw SentMailboxNotSetException when sent mailbox not configured

[Copilot]

SentMailboxNotSetException was defined in the interface contract but never thrown. Error handling relied solely on status codes, resulting in generic error messages and no actionable feedback for missing sent mailbox configuration.

Changes

Backend

• SentMailboxHandler now throws SentMailboxNotSetException with warning log (accountId, userId)
• Chain catches exception, logs at info level (accountId, messageId), sets STATUS_NO_SENT_MAILBOX
• OutboxController returns HTTP 403 with user-actionable message instead of generic error

Frontend

• Added STATUS_NO_SENT_MAILBOX constant
• OutboxMessageListItem displays "No 'Sent' folder configured. Please pick one in account settings" and disables retry button

Tests

• Updated unit tests to verify exception throw/catch flow and dual logging

Example Flow

// SentMailboxHandler.php
if ($account->getMailAccount()->getSentMailboxId() === null) {
    $this->logger->warning('No sent mailbox configured', ['accountId' => ...]);
    throw new SentMailboxNotSetException();
}

// Chain.php
try {
    $result = $handlers->process($account, $localMessage, $client);
} catch (SentMailboxNotSetException $e) {
    $this->logger->info('Message send aborted: No sent mailbox', ['accountId' => ...]);
    $localMessage->setStatus(LocalMessage::STATUS_NO_SENT_MAILBOX);
    return $this->localMessageMapper->update($localMessage);
}

Error messages are now consistent across UI, API, and logs, providing clear guidance to configure sent folder in account settings.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

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If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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