fix(rtl): set dir=ltr on identity <option> elements

The From-identity picker in the composer and the template form use a
native <select>, so the earlier <bdi> fix can't apply there - browsers
render <option> as plain text and strip any nested markup. The native
OS-rendered option list still respects the dir attribute directly
though, so setting dir="ltr" on each option fixes the same bracket-
mirroring bug for "Name <email>" entries in that native popup.

components/templates/template-form.tsx

@@ -242,7 +242,7 @@ export function TemplateForm({ template, initialData, onSave, onCancel }: Templa
           >
             <option value="">{tSettings('default_identity')}</option>
             {identities.map((id) => (
-              <option key={id.id} value={id.id}>
+              <option key={id.id} value={id.id} dir="ltr">
                 {id.name ? `${id.name} <${id.email}>` : id.email}
               </option>
             ))}