Rename Copy to Send and put it first in the row context menu

The main feature (copy selection to the other panel, F5) is now labeled
"Send" in the toolbar button, tooltips, and context menu across all 7
locales. Internal identifiers (copyToOtherPanel, ctx-copy, i18n keys)
and secondary strings (toasts, status bar, errors) are unchanged.
The context-menu entry moves ahead of Open/Edit as the first row item.
README, marketing site, and the Windows QA checklist updated to match.

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

src/shared/i18n/fr.ts

@@ -78,9 +78,9 @@ export const fr = {
 	},
 	panel: {
 		choosePanel: "Choisir ce qu'affiche ce panneau",
-		copy: "Copier",
-		copyToRight: "Copier vers le panneau droit (F5)",
-		copyToLeft: "Copier vers le panneau gauche (F5)",
+		copy: "Envoyer",
+		copyToRight: "Envoyer vers le panneau droit (F5)",
+		copyToLeft: "Envoyer vers le panneau gauche (F5)",
 		edit: "Éditer",
 		editFile: "Éditer le fichier (F4)",
 		rename: "Renommer (F2)",
@@ -282,7 +282,7 @@ export const fr = {
 		open: "Ouvrir",
 		openDefault: "Ouvrir avec l'application par défaut",
 		edit: "Éditer",
-		copyToOther: "Copier vers l'autre panneau",
+		copyToOther: "Envoyer vers l'autre panneau",
 		rename: "Renommer",
 		permissions: "Autorisations",
 		copyPath: "Copier le chemin",