Improved A2P Campaign Rejection Feedback

We've made it easier to understand why an A2P campaign was rejected and what the user needs to do to fix it.
What's new : 
When a campaign submission is rejected, users will now see a "View required fixes →" link next to each rejection reason.
Clicking it opens a detailed modal that breaks down the issue into four clear fields:
Error code – the specific code returned by the carriers.
Rejection category – a human-readable label for the type of violation (e.g., Invalid website URL).
What it means – a concise explanation of why the submission failed.
Correction needed – the exact action required before resubmitting.
Previously, rejection reasons were displayed as short descriptions with no additional context, leaving users confused about the precise cause of rejection and the required next steps.
Why it matters : 
This change shares precise feedback with the user so they can fix issues faster with lesser assistance required from customer support and consequently resubmit with confidence.