## Description
Fixes CW-5961 where IMAP email processing failed with
`ActiveRecord::RecordInvalid: Validation failed: Source is too long
(maximum is 255 characters)` error.
This changes the `contact_inboxes.source_id` column from `string` (255
character limit) to `text` (unlimited) to accommodate long email message
IDs that were causing validation failures.
Fixes CW-5961
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
## How Has This Been Tested?
- Added spec test validating `source_id` values longer than 255
characters (300 chars)
- All existing `contact_inbox_spec.rb` tests pass (7 examples, 0
failures)
- Migration applied successfully with reversible up/down methods
- Verified `source_id` column type changed to `text` with `null: false`
constraint preserved
## Checklist:
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
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