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/settings/folder-settings.tsx

@@ -90,7 +90,7 @@ function IconPicker({ currentIcon, onSelect, onClose }: {
   return (
     <div
       ref={ref}
-      className="absolute left-0 top-full mt-1 z-50 bg-background border border-border rounded-lg shadow-lg p-2 grid grid-cols-6 gap-1 w-52"
+      className="absolute start-0 top-full mt-1 z-50 bg-background border border-border rounded-lg shadow-lg p-2 grid grid-cols-6 gap-1 w-52"
     >
       {ICON_CHOICES.map(({ name, icon: Icon }) => (
         <button