port: P3-d PythonTextTail + textTail module (1:1 40250)

Copy PythonTextTail.cpp/PythonTextTailModule.cpp verbatim, drop the pending
stand-in and the textTail module stub, register initTextTail() after
initChat() and call CPythonTextTail::Initialize() in Create as 40250 does.
Implement CScreen::ProjectPosition/UnprojectPosition (were stubs) with
D3DXVec3Project/Unproject, and ApplicationStringTable_GetString(DWORD) over
UserInterface.rc's English string table. port.login_flow projects the ground
item's name tail in an ALT frame and picks it back by screen position.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/platform/UserInterface/PythonApplication.cpp

@@ -8,6 +8,7 @@
 #include "UserInterface/PythonNetworkStream.h"
 #include "UserInterface/AccountConnector.h"
 #include "UserInterface/PythonItem.h"
+#include "UserInterface/PythonTextTail.h"
 #include "UserInterface/PythonSkill.h"
 #include "UserInterface/PythonNonPlayer.h"
 #include "GameLib/ItemManager.h"
@@ -124,6 +125,9 @@ bool CPythonApplication::Create(PyObject*, const char*, int, int, int)
 	// 40250 m_pyItem.Create() (PythonApplication.cpp:1253): registers dropitem.mse with CEffectManager,
 	// still a platform stub.
 	CPythonItem::Instance().Create();
+
+	// 40250 PythonApplication.cpp:1260, after DefaultFont_Startup and the IME.
+	CPythonTextTail::Instance().Initialize();
 	return true;
 }
 // 40250 PythonApplication.cpp:105
@@ -404,7 +408,6 @@ bool LoadLocaleData(const char* localePath)
 	NANOEND
 		return true;
 }
-void TextTail_SetLivingTime(long) { MT_PLATFORM_STUB(); }
 namespace {
 // The supplied 40250 Client/locale.cfg selects "en" (code page 1252).
 // Keep these mutable for app.ForceSetLocale, as Locale.cpp does.