HUD: centre the taskbar, move the portrait/health panel to the right edge

New mods/hud: while a HUD window renders, screen-space vertices passed to
D3D7 DrawPrimitive/DrawIndexedPrimitive are shifted by dx; while it handles
an event, the UI event point (category 5, +0x48) is shifted by -dx. Applied
to cUI_Taskbar2 (centred) and cUI_Mercenary (portrait + health, right edge).
3D belt items line up without help (their projection is screen-centred).
re::AttachRuntimeHook hooks functions only known at runtime (COM methods).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/re/hook.cpp

@@ -59,4 +59,22 @@ int InstallHooks() {
     return failed;
 }
 
+bool AttachRuntimeHook(const char* name, void** original, void* replacement) {
+    const void* target = *original;
+    DetourTransactionBegin();
+    DetourUpdateThread(GetCurrentThread());
+    LONG error = DetourAttach(original, replacement);
+    if (error == NO_ERROR) {
+        error = DetourTransactionCommit();
+    } else {
+        DetourTransactionAbort();
+    }
+    if (error != NO_ERROR) {
+        Log("hook %-24s %p  FAILED (error %ld)", name, target, error);
+        return false;
+    }
+    Log("hook %-24s %p  attached at runtime", name, target);
+    return true;
+}
+
 } // namespace re

src/re/hook.h

@@ -31,6 +31,11 @@ public:
 // number of hooks that failed to attach.
 int InstallHooks();
 
+// Hooks a function only known at runtime (e.g. a COM method read from a
+// vtable). `*original` must hold the function's address; it receives the
+// trampoline. Returns false (and logs) on failure.
+bool AttachRuntimeHook(const char* name, void** original, void* replacement);
+
 } // namespace re
 
 // Hooks a Windows API function for the whole process (game and DLLs alike).