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/email/rich-text-editor.tsx

@@ -418,7 +418,7 @@ export function RichTextEditor({
             <Baseline className="w-4 h-4" style={{ color: editor.getAttributes("textStyle").color || undefined }} />
           </ToolbarButton>
           {colorMenuOpen && (
-            <div className="absolute z-50 top-full left-0 mt-1 bg-popover border border-border rounded-md shadow-md p-2">
+            <div className="absolute z-50 top-full start-0 mt-1 bg-popover border border-border rounded-md shadow-md p-2">
               <div className="grid gap-0.5" style={{ gridTemplateColumns: "repeat(8, 1fr)" }}>
                 {TEXT_COLORS.map((color) => (
                   <button
@@ -559,7 +559,7 @@ export function RichTextEditor({
             <TableIcon className="w-4 h-4" />
           </ToolbarButton>
           {tableMenuOpen && (
-            <div className="absolute z-50 top-full left-0 mt-1 bg-popover border border-border rounded-md shadow-md p-2 min-w-[200px]">
+            <div className="absolute z-50 top-full start-0 mt-1 bg-popover border border-border rounded-md shadow-md p-2 min-w-[200px]">
               {editor.isActive("table") ? (
                 <div className="flex flex-col gap-0.5">
                   <button