chore: remove share opinion sidebar prompt

Delete the share opinion dialog and its sidebar trigger.
Remove the related toast and footer action wiring.
Clean up unused i18n entries in all supported languages.

packages/ui/src/components/session/sidebar/SidebarFooter.tsx

@@ -9,7 +9,6 @@ type Props = {
   onOpenShortcuts: () => void;
   onOpenAbout: () => void;
   onOpenUpdate: () => void;
-  onOpenShareOpinion: () => void;
   showRuntimeButtons?: boolean;
   showUpdateButton?: boolean;
 };
@@ -21,12 +20,15 @@ export function SidebarFooter({
   onOpenShortcuts,
   onOpenAbout,
   onOpenUpdate,
-  onOpenShareOpinion,
   showRuntimeButtons = true,
   showUpdateButton = true,
 }: Props): React.ReactNode {
   const { t } = useI18n();
 
+  if (!showRuntimeButtons && !showUpdateButton) {
+    return null;
+  }
+
   return (
     <div className="flex shrink-0 items-center justify-start gap-1 px-2.5 py-2">
       {showRuntimeButtons ? (
@@ -67,17 +69,7 @@ export function SidebarFooter({
         >
           {t('sessions.sidebar.footer.actions.update')}
         </Button>
-      ) : (
-        <Button
-          type="button"
-          variant="default"
-          size="xs"
-          className="ml-auto border-[var(--primary-base)]/15 bg-[var(--primary-base)]/5 text-[var(--primary-base)]/60 hover:bg-[var(--primary-base)]/10 hover:text-[var(--primary-base)]/75"
-          onClick={onOpenShareOpinion}
-        >
-          {t('sessions.sidebar.footer.actions.shareOpinion')}
-        </Button>
-      )}
+      ) : null}
     </div>
   );
 }