Move settings into a standalone Settings window

The tab-bar popover had outgrown itself. Settings now open in their own
native window (a fourth window kind, built like the connection manager but
not modal): a sidebar with Appearance, Transfers, Editor, File list and
About, holding every popover row plus the visible-columns choice. Each
control is an ordinary settings save, so the other windows follow live
while it stays open.

The gear button in the tab bar, Ctrl+, and the macOS app menu's
"Settings..." (Cmd+,) open it. On macOS Cmd+W arrives as the main window's
close-tab menu action, so bun closes the focused Settings window first
instead of a main-window tab.

Co-Authored-By: Claude <noreply@anthropic.com>

src/shared/i18n/fr.ts

@@ -23,14 +23,22 @@ export const fr = {
 		manageConnections: "Gérer les connexions",
 		newTab: "Nouvel onglet ({mod}T)",
 		closeTab: "Fermer l'onglet ({mod}W)",
-		options: "Options",
+		options: "Réglages",
 		update: "Mise à jour disponible",
 		updating: "Mise à jour",
 		restartToUpdate: "Redémarrer pour appliquer",
 		updateTooltip: "Mise à jour disponible : miniSCP {version}",
 	},
 	options: {
-		title: "Options",
+		title: "Réglages",
+		sections: {
+			appearance: "Apparence",
+			transfers: "Transferts",
+			editor: "Éditeur",
+			fileList: "Liste des fichiers",
+			about: "À propos",
+		},
+		columns: "Colonnes visibles",
 		language: "Langue",
 		system: "Système",
 		theme: { label: "Thème", system: "Système", light: "Clair", dark: "Sombre" },
@@ -248,6 +256,7 @@ export const fr = {
 	},
 	menu: {
 		about: "À propos de {app}",
+		settings: "Réglages…",
 		checkForUpdates: "Rechercher des mises à jour…",
 		quit: "Quitter",
 		file: "Fichier",