stage-344: maintainer fix for #2142 fr locale — add LOCALES tuple entries + _LOGIN_LOCALE block

#2142 (legeantbleu) added the fr locale to static/i18n.js but didn't update:
1. tests/test_issue1488_composer_voice_buttons.py: two TestComposerVoiceButtonI18n + TestVoiceModePreferenceGate LOCALES tuples needed 'fr'
2. api/routes.py: _LOGIN_LOCALE needed an 'fr' block so the login page localizes for French users (issue #1442 parity contract)
3. tests/test_login_locale_parity.py: the test asserting 'fr' falls-back-to-'en' is inverted — fr now resolves to fr, with sibling assertions for fr-FR and fr-CA

Mirrors the stage-340 fix for the it locale (PR #2067 → maintainer adds tuple entries). 46/46 i18n tests pass after fix.

api/routes.py

@@ -1928,6 +1928,15 @@ _LOGIN_LOCALE = {
         "invalid_pw": "Invalid password",
         "conn_failed": "Connection failed",
     },
+    "fr": {
+        "lang": "fr-FR",
+        "title": "Se connecter",
+        "subtitle": "Entrez votre mot de passe pour continuer",
+        "placeholder": "Mot de passe",
+        "btn": "Se connecter",
+        "invalid_pw": "Mot de passe invalide",
+        "conn_failed": "\u00c9chec de la connexion",
+    },
     "es": {
         "lang": "es-ES",
         "title": "Iniciar sesi\u00f3n",

tests/test_issue1488_composer_voice_buttons.py

@@ -123,7 +123,7 @@ class TestComposerVoiceButtonI18n:
         "voice_mode_toggle_active",
     )
 
-    LOCALES = ("en", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
+    LOCALES = ("en", "fr", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
 
     def test_legacy_voice_toggle_key_removed(self):
         """The old key whose string was 'Voice input' caused the duplicate-
@@ -171,7 +171,7 @@ class TestComposerVoiceButtonI18n:
 class TestVoiceModePreferenceGate:
     """boot.js must hide btnVoiceMode by default, surface it via Preferences."""
 
-    LOCALES = ("en", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
+    LOCALES = ("en", "fr", "it", "ja", "ru", "es", "de", "zh", "zh-Hant", "pt", "ko")
 
     def test_voice_mode_pref_is_localstorage_backed(self):
         """The pref reads from localStorage key 'hermes-voice-mode-button'."""

tests/test_login_locale_parity.py

@@ -293,8 +293,10 @@ def test_login_locale_resolver_handles_new_locales():
     assert _resolve_login_locale_key("pt-PT") == "pt"
     assert _resolve_login_locale_key("ko") == "ko"
     assert _resolve_login_locale_key("ko-KR") == "ko"
+    assert _resolve_login_locale_key("fr") == "fr"
+    assert _resolve_login_locale_key("fr-FR") == "fr"
+    assert _resolve_login_locale_key("fr-CA") == "fr"
     # Unknown locale still falls back to en.
-    assert _resolve_login_locale_key("fr") == "en"
     assert _resolve_login_locale_key("xx-YY") == "en"