feat(webui): add context window setting

webui/src/i18n/locales/fr/common.json

@@ -137,7 +137,8 @@
       "cliAppsFilter": "Filtre des apps CLI",
       "engine": "Moteur",
       "logs": "Journaux",
-      "diagnostics": "Diagnostics"
+      "diagnostics": "Diagnostics",
+      "contextWindow": "Context window"
     },
     "help": {
       "theme": "Basculer entre les apparences claire et sombre.",
@@ -175,7 +176,8 @@
       "logs": "Ouvrir le dossier des journaux du moteur natif.",
       "diagnostics": "Exporter un petit rapport runtime pour le support.",
       "localServiceAccessNative": "Allow Full Access shell commands to reach services on this Mac.",
-      "webuiDefaultAccessNative": "Used by native chats without a project-specific permission."
+      "webuiDefaultAccessNative": "Used by native chats without a project-specific permission.",
+      "contextWindow": "Choose the default context budget for this model configuration."
     },
     "values": {
       "light": "Clair",