[_]: feat/add dropdown to select inxt domain

[xabg2]

Adding a dropdown to select the init domain when setting up the identity.

[coderabbitai]

📝 Walkthrough

Walkthrough

Added INTERNXT_EMAIL_DOMAINS constant, created SelectMailInput component for email domain selection, refactored UpdateEmail to use the new component for username and domain input, and updated import paths in mail tray components.

Changes

Cohort / File(s)	Summary
Email Domain Constants src/constants.ts	Added INTERNXT_EMAIL_DOMAINS readonly tuple containing three Internxt email domain suffixes.
Identity Setup Email Components src/features/identity-setup/components/SelectMailInput.tsx, src/features/identity-setup/components/UpdateEmail.tsx	New SelectMailInput component with dropdown domain selector and text input. Refactored UpdateEmail to replace single email input with username and domain state, using new component for composition.
Mail Tray Import Paths src/features/mail/components/tray/header/index.tsx, src/features/mail/components/tray/index.tsx	Updated import paths from camelCase to kebab-case filenames (searchInput → search-input, trayEmptyState → tray-empty-state).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a dropdown component to select Internxt domains during identity setup, which is reflected across the new SelectMailInput component and UpdateEmail modifications.
Description check	✅ Passed	The description is directly related to the changeset, accurately describing the addition of a dropdown for selecting the Internxt domain during identity setup.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/dropdown-to-select-inxt-domain-when-setting-up-new-mail

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

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👉 Steps to fix this

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/features/identity-setup/components/SelectMailInput.tsx`:
- Around line 35-44: The text input in SelectMailInput lacks a programmatic
label; update the input inside the SelectMailInput component to include an
accessible name (either add a visible <label> and connect it via htmlFor/id or
add an appropriate aria-label/aria-labelledby) so assistive tech can identify
the username field; ensure the chosen label text clearly describes the purpose
(e.g., "email username" or "username") and use the existing props/state (value,
onChangeValue, setIsFocused) without changing their behavior.

In `@src/features/identity-setup/components/UpdateEmail.tsx`:
- Around line 22-25: The click handler currently forwards fullEmail without
validating username; update handleOnClick in UpdateEmail.tsx to trim and
validate username (e.g., const sanitized = username.trim(); ensure sanitized is
non-empty and matches your allowed pattern such as alphanumeric plus allowed
symbols) and only call onNext(`${sanitized}${domain}`) when valid; when invalid,
prevent advancing and surface feedback (set a local error state like
usernameError or disable the Next button) so empty/whitespace/illegal usernames
are blocked before calling onNext.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: ff25c23d-73d4-4587-818a-322b97057559

📥 Commits

Reviewing files that changed from the base of the PR and between c0fa5c8 and 52d7dc4.

📒 Files selected for processing (7)

• src/constants.ts
• src/features/identity-setup/components/SelectMailInput.tsx
• src/features/identity-setup/components/UpdateEmail.tsx
• src/features/mail/components/tray/header/index.tsx
• src/features/mail/components/tray/index.tsx
• src/features/mail/components/tray/search-input/index.tsx
• src/features/mail/components/tray/tray-empty-state/index.tsx