Esc menu without "Exportieren"; export screen mod removed

- cUI_EscMenu::BuildLines hook: the UI_ESC_EXPORT line is removed, the
  lines below move up, the window shrinks by one line, centred.
- game/ui/control.h: control vector helpers (ControlsIn, RemoveControl,
  SetControlAt, DeleteControl, ControlNamed), used by the main menu too.
- The export screen is unreachable now: charexport.cpp and
  docs/char-export.md deleted. Spielen screen redesign noted in todo.md.

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

src/mods/characters.cpp

@@ -1345,6 +1345,43 @@ int __fastcall UiManager_ReceiveEvent(void* self, void* edx, uint8_t* event) {
 constexpr uint32_t kEscMenuSaveLineText = 0x006bc1f7;
 constexpr uint32_t kSavegamesText = 0x41b;
 
+// The Esc menu without "Exportieren" (request of 2026-10-20; exported heroes
+// are gone). cUI_EscMenu::BuildLines (0x6bb870, thiscall, plain ret; called
+// by the constructor 0x6bae60 and on an event, 0x6bc497) makes five
+// cUI_StaticText64 lines (constructor 0x753470) in the vector at +0x158, 0x24
+// apart (y 8 .. 0x98); each line handles its own events. The window is
+// 0x108 x 0xc8, centred (0x6bae9b). The export line goes, the lines below it
+// move up and the window loses one line's height, staying centred.
+constexpr size_t kEscMenuLines = 0x158;
+constexpr char kEscExportLine[] = "UI_ESC_EXPORT";
+constexpr int kEscLinePitch = 0x24;
+constexpr int16_t kEscMenuHeight = 0xc8;
+
+void __fastcall EscMenu_BuildLines(uint8_t* self, void* edx);
+RE_HOOK(0x006bb870, EscMenu_BuildLines);
+void __fastcall EscMenu_BuildLines(uint8_t* self, void* edx) {
+    EscMenu_BuildLines_original(self, edx);
+    bool removed = false;
+    for (uint8_t* line : game::ControlsIn(self, kEscMenuLines)) {
+        auto& rect = *reinterpret_cast<game::UiRect*>(line + game::kControlRect);
+        if (removed) {
+            rect.y -= kEscLinePitch;
+        } else if (game::ControlNamed(line, kEscExportLine)) {
+            game::RemoveControl(self, kEscMenuLines, line);
+            game::DeleteControl(line);
+            removed = true;
+        }
+    }
+    auto& window = *reinterpret_cast<game::UiRect*>(self + game::kControlRect);
+    if (removed && window.h == kEscMenuHeight) {
+        window.h -= kEscLinePitch;
+        window.y += kEscLinePitch / 2;
+    }
+    if (!removed) {
+        re::Log("characters: Esc menu has no %s line", kEscExportLine);
+    }
+}
+
 // The load window's second line of a row showed the (preview) file name; it
 // shows the level and the chosen difficulty instead. Row texts are set every
 // frame (0x71d830): line 1 the save's name (+0x204), line 2 the file name (+4,