### Description
Refactored the recent domains section from being an inline constant in
`SignUp.tsx` into a dedicated, reusable React component. This improves
code organization, maintainability, and testability.
### Changes Made
- **Created new component**: `RecentDomainsSection.tsx`
- Encapsulates all logic for rendering recent organization domains
- Handles conditional rendering internally (returns null when no
domains)
- Includes proper TypeScript types and imports
- **Updated SignUp component**:
- Removed inline `recentDomainsSection` constant definition
- Added import for new `RecentDomainsSection` component
- Replaced usage with JSX component
- **Improved avatar logic**:
- Changed from alphabetical cycling (`String.fromCharCode(65 + (index %
26))`) to using the actual organization name's first letter
(`orgName.charAt(0).toUpperCase()`)
- This provides more meaningful and recognizable avatars for users
## Automation
/ok-to-test tags="@tag.Sanity, @tag.Authentication"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/15838492574>
> Commit: f4c799f7fd76851b404ddddd441728d9bd6445ca
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=15838492574&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity, @tag.Authentication`
> Spec:
> <hr>Tue, 24 Jun 2025 01:35:51 UTC
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced a dedicated section to display recently accessed domains
during user sign-up, allowing quick access to previously used domains.
- **Refactor**
- Modularized the recent domains display by moving its logic and UI into
a separate component for improved maintainability and clarity.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
