## Description
Adds the account-level `unread_count_for_filters` feature flag as the
dark-launch gate for filtered sidebar unread counts. This reuses the
deprecated `quoted_email_reply` flag slot, resets the reused bit for
existing accounts, and removes stale defaults so new accounts do not
reference the old flag.
This also adds the feature where we are now calculating the unread counts for built in filters like mentions, participating and unattended along with unread count for saved filters/folders.
Closes
[CW-7262](https://linear.app/chatwoot/issue/CW-7262/unread-counts-for-filters-folders)
## Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update
## Summary
- Remove label deletion dependency on association cleanup by deleting
immediately and enqueueing a background job.
- Add `Labels::RemoveAssociationsJob` to strip deleted label references
from tagged conversations and contacts.
- Keep this version simple by removing the label count/prompt
requirement requested.
## Implementation notes
- Enqueue job from `Api::V1::Accounts::LabelsController#destroy` with
label title + account id.
- Background work performed in `Labels::DestroyService`.
## References
- Linear issue:
https://linear.app/chatwoot/issue/CW-4765/cw-2857-enhancement-removing-labels-is-inconsistent
- GitHub issue: https://github.com/chatwoot/chatwoot/issues/1249
## Testing
- `bundle exec rspec
spec/controllers/api/v1/accounts/labels_controller_spec.rb
spec/services/labels/destroy_service_spec.rb
spec/jobs/labels/remove_associations_job_spec.rb
spec/services/labels/update_service_spec.rb`
- `bundle exec rubocop
app/controllers/api/v1/accounts/labels_controller.rb
app/jobs/labels/remove_associations_job.rb
spec/controllers/api/v1/accounts/labels_controller_spec.rb
spec/jobs/labels/remove_associations_job_spec.rb
spec/services/labels/destroy_service_spec.rb`
---------
Co-authored-by: Sony Mathew <sony@chatwoot.com>
Co-authored-by: Sony Mathew <2040199+sony-mathew@users.noreply.github.com>
