## Summary
Fix hardcoded `Chatwoot` branding in two UI tooltips using the existing
`useBranding` flow so self-hosted/white-label deployments no longer show
the wrong brand text.
## Changes
- LabelSuggestion tooltip now uses:
- `replaceInstallationName($t('LABEL_MGMT.SUGGESTIONS.POWERED_BY'))`
- Message avatar tooltip (native app/external echo) now uses:
- `replaceInstallationName(t('CONVERSATION.NATIVE_APP_ADVISORY'))`
## Why
This follows the existing branding pattern already used in the product
and keeps behavior consistent across deployments.
## Notes
- No change to message logic or API behavior.
- `AGENTS.md` updated with a branding guidance note.
## Fixes
- Fixes https://github.com/chatwoot/chatwoot/issues/13306
- Fixes https://github.com/chatwoot/chatwoot/issues/13466
## Testing
<img width="195" height="155" alt="Screenshot 2026-02-13 at 3 55 39 PM"
src="https://github.com/user-attachments/assets/5b295cdd-6e5d-42c0-bbd7-23ba7052e1c3"
/>
<img width="721" height="152" alt="Screenshot 2026-02-13 at 3 55 48 PM"
src="https://github.com/user-attachments/assets/19cec2a0-451f-4fb3-bd61-7c2e591fc3c7"
/>
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