fix: implement draft editing functionality across email components and add localization keys

locales/en/common.json

@@ -195,6 +195,8 @@
     "import_email": "Import .eml",
     "keyboard_shortcuts": "Keyboard shortcuts (?)",
     "email_source": "Email Source",
+    "draft_banner": "This message is a draft",
+    "edit_draft": "Edit",
     "copy_source": "Copy to clipboard",
     "source_copied": "Source copied to clipboard",
     "attachments": "Attachments",
@@ -298,7 +300,8 @@
       "unstar": "Unstar (s)",
       "compose": "Compose (c)",
       "previous": "Previous email",
-      "next": "Next email"
+      "next": "Next email",
+      "edit_draft": "Edit draft"
     },
     "spam": {
       "button_title": "Report spam",
@@ -1298,7 +1301,8 @@
     "not_spam": "Not spam",
     "color_tag": "Label",
     "remove_color": "Remove Label",
-    "items_selected": "{count} emails selected"
+    "items_selected": "{count} emails selected",
+    "edit_draft": "Edit Draft"
   },
   "shortcuts": {
     "title": "Keyboard Shortcuts",