London | 26-Jul-SDC | Roman Sanaye | Sprint 1| Purple Forest: Extra long blooms

[RomanSanaye]

Task code : CYF-1168

What does this PR do?

• Adds backend validation for the Bloom character limit.
• Prevents users from submitting Blooms longer than 280 characters.
• Keeps the existing frontend maxlength="280" validation.

Why is this change needed?

The frontend already limits Blooms to 280 characters, but the backend did not validate the length. This meant a Bloom longer than 280 characters could still be submitted directly to the backend.

How was it tested?

• Tested a Bloom with exactly 280 characters — accepted.
• Tested a Bloom with 288 characters — rejected with a 400 response.
• Confirmed the existing frontend maxlength="280" remains in place.

Self-checklist

• I have tested my changes.
• I have checked that my changes follow the existing code style.
• I have completed the required task.
• I have removed unnecessary code/comments.
• I am ready for review.