Fix missing Open Mail button and bump to 1.4.9

- Recreate the Open Mail button if it is missing
- Restore its parent, position, text and click handler
- Ensure the button stays visible above the inbox UI
- Reapply the fix when the mailbox opens or updates
- Bump version to 1.4.9

README.md

@@ -76,7 +76,7 @@ When enabled, TurtleMail records sent and received mail information in its dedic
 
 ## 🔧 Turtle WoW compatibility
 
-Version **1.4.8** extends the compatibility and safety layer for Turtle WoW 1.18.x environments.
+Version **1.4.9** extends the compatibility and safety layer for Turtle WoW 1.18.x environments.
 
 The compatibility work is isolated in `TurtleMailFix.lua` so the original TurtleMail code remains easier to compare with upstream versions.
 
@@ -96,6 +96,7 @@ The compatibility work is isolated in `TurtleMailFix.lua` so the original Turtle
 - Rebound the safer `OnUpdate` handler correctly after loading the compatibility layer.
 - Prevented the send queue from remaining stuck when an attachment becomes unavailable during sending.
 - Fixed `MailMailButton` nil crashes while enabling/disabling or clearing the send form, and hardened the paired subject edit-box reference.
+- Restored the missing **Open Mail** button by making its creation idempotent and reasserting its parent, position, visibility, click handler, and frame level when the mailbox refreshes.
 
 The complete technical audit is available in [`AUDIT.md`](AUDIT.md).
 
@@ -130,11 +131,11 @@ TurtleMail includes localization support for:
 
 Current stable version:
 
-**1.4.8**
+**1.4.9**
 
 Based on upstream **TurtleMail 1.4.5**.
 
-Version 1.4.8 adds an additional safeguard for the legacy send-button proxy used by TurtleMail. The earlier compatibility fixes remain unchanged.
+Version 1.4.9 adds recovery for the **Open Mail** inbox button when its initial creation is interrupted or another UI addon hides/re-parents it. The earlier compatibility fixes remain unchanged.
 
 ## 🖼️ Screenshots