fix(rtl): anchor floating menus with logical start/end instead of left/right

Popovers and dropdown menus across the app (sub-address helper, calendar
toolbar/color pickers, contact/template/attachment menus, rich text editor
color and table pickers, unsubscribe confirmation, composer send menu)
were anchored with physical `left-0`/`right-0`. In RTL locales those
don't flip with the trigger, so the menu detaches from the button that
opened it. Switched to Tailwind's logical `start-0`/`end-0` (and the
matching `rounded-s-*`/`rounded-e-*` corners on hover-action overlays)
so they mirror correctly for RTL locales (ar, he, fa) while staying
identical in LTR.

components/identity/sub-address-helper.tsx

@@ -137,7 +137,7 @@ export function SubAddressHelper({
         <div
           ref={popoverRef}
           className={cn(
-            'absolute top-full right-0 mt-1 z-50',
+            'absolute top-full end-0 mt-1 z-50',
             'bg-background border border-border rounded-lg shadow-lg',
             'w-80 p-4 animate-in fade-in zoom-in-95 duration-150'
           )}