Handle non-standard second-level domains in getRootDomain

[Copilot]

getRootDomain relied on a narrow hardcoded second-level suffix set, which caused incorrect root extraction for domains like mon-site.asso.fr (returned as asso.fr). This impacted whitelist targeting and redirect-domain comparison for ccTLD patterns outside the original list.

• Domain parsing update (utils.js)

  • Expanded secondLevelSuffixes used by getRootDomain to recognize additional second-level labels used with 2-letter TLDs:
    • added: asso, gouv, nom
  • Existing behavior for already-supported patterns (e.g. co.uk, com.au) remains unchanged.

• Behavioral impact

  • Root domain extraction now preserves expected registrable domains for additional ccTLD forms, including the reported .asso.fr case.

const secondLevelSuffixes = new Set([
  "ac", "asso", "co", "com", "edu", "gov", "gouv", "net", "nom", "org"
]);

Original prompt

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This section details on the original issue you should resolve

<issue_title>Défaillance du parseur sur les domaines de second niveau non standards</issue_title>
<issue_description>## Contexte
La fonction getRootDomain centralise l'extraction du domaine racine pour la mise en liste blanche et la comparaison des redirections.

Problème

La constante secondLevelSuffixes est codée en dur avec une liste très restreinte (ac, co, com, edu, gov, net, org). Les domaines utilisant d'autres suffixes (comme .asso.fr ou .com.au) sont mal découpés.

Scénario de Reproduction

1. Naviguer sur mon-site.asso.fr.
2. Ouvrir la popup de l'extension.
3. Observer le domaine proposé pour l'ajout.

Comportement Attendu

Le système doit extraire mon-site.asso.fr et non asso.fr.

Pistes Techniques

Remplacer l'approche par liste statique restrictive par l'intégration d'une librairie légère gérant la Public Suffix List (PSL), ou élargir la liste des suffixes reconnus dans utils.js.

Environnement

Toutes plateformes.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Défaillance du parseur sur les domaines de second niveau non standards #17

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[Copilot]

Pull request overview

Updates getRootDomain’s ccTLD handling to correctly extract registrable domains for additional second-level domain patterns (e.g., .asso.fr), improving whitelist targeting and redirect-domain comparisons across more real-world ccTLD structures.

Changes:

• Expanded secondLevelSuffixes in utils.js to include asso, gouv, and nom.
• Preserved existing behavior for previously supported patterns (e.g., co.uk, com.au).

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[Copilot]

secondLevelSuffixes is instantiated on every getRootDomain call. Consider hoisting it to a module-level constant (e.g., const SECOND_LEVEL_SUFFIXES = new Set([...])) to avoid repeated allocations and make future updates easier.