Make Open Mail recovery lazy and bump to 1.4.12

- Leave the existing Open Mail button untouched during normal mailbox opens
- Only run full recovery if the button is missing, hidden or re-parented
- Match Otari-style normal behavior while keeping compatibility recovery
- Keep Open All, inbox polling, sending and logging unchanged
- Bump version to 1.4.12

TurtleMailFix.lua

@@ -8,7 +8,7 @@ local m = TurtleMail
 local getn = table.getn
 local function pack( ... ) return arg end
 
-m.compat_version = "1.4.11"
+m.compat_version = "1.4.12"
 
 local DEFAULT_SENT_FILTERS = {
   Money = 1,
@@ -475,11 +475,22 @@ end
 
 -- Safer MAIL_SHOW: package-button regions differ between UI replacements.
 function m.MAIL_SHOW()
-  -- Re-assert the legacy references whenever the mailbox opens. This also
-  -- recovers if another UI addon changed those globals after addon loading.
+  -- Re-assert the legacy send-widget references whenever the mailbox opens.
+  -- Open Mail follows the lighter Otari-style path: when the existing button
+  -- is still shown and parented to InboxFrame, do nothing at all. Only invoke
+  -- the full recovery routine if the button is missing, hidden, or re-parented.
   ensure_send_mail_button()
   ensure_subject_edit_box()
-  ensure_open_mail_button()
+
+  local open_mail_button = m.api.TurtleMailOpenMailButton
+  local open_mail_ok = open_mail_button
+    and type( open_mail_button.SetPoint ) == "function"
+    and (not open_mail_button.GetParent or open_mail_button:GetParent() == m.api.InboxFrame)
+    and (not open_mail_button.IsShown or open_mail_button:IsShown())
+
+  if not open_mail_ok then
+    ensure_open_mail_button()
+  end
 
   if not m.api.MailFrame then return end