Teleportationstrank: yellow potions open the portal window

- Every yellow potion (potion kind 5, all stages) is a Teleportationstrank:
  drinking it posts the teleporter's event to the busy dialog with the
  hero's known portals; the potion is used up only when the hero teleports
  from that window (closing it keeps the potion)
- Names replaced in every game text (ReplaceInTexts), so item names and the
  bottom bar's quick-select tooltip read Teleportationstrank; GameText reads
  the game's own text
- HeroIndex / HeroInventory moved to skillslots for shared use
- docs/teleport-potion.md; walking animation after loading noted in todo

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

src/game/ui/texts.cpp

@@ -8,11 +8,17 @@
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
+#include <utility>
 #include <vector>
 
 #include "re/hook.h"
 
 namespace game {
+
+// GetText (0x672f70, ret 4): (id) -> string; ours first.
+const void* __fastcall TextManager_GetText(void* self, void* edx, uint32_t id);
+RE_HOOK(0x00672f70, TextManager_GetText);
+
 namespace {
 
 // Our ids: above the game's (resource ids are small; bit 31 means "by index").
@@ -26,10 +32,13 @@ struct GameString {
     const wchar_t* capacity;
 };
 
-struct Capitalized {
+// A game text as we show it: made from `source` (the game's) when that
+// changes; `changed` false if ours is the same.
+struct Shown {
     std::wstring source;
     std::wstring text;
     GameString string;
+    bool changed = false;
 };
 
 std::mutex g_lock;
@@ -41,8 +50,12 @@ std::unordered_set<uint32_t>& CapitalizedIds() {
     static std::unordered_set<uint32_t> ids;
     return ids;
 }
+std::vector<std::pair<std::wstring, std::wstring>>& Replacements() {
+    static std::vector<std::pair<std::wstring, std::wstring>> replacements;
+    return replacements;
+}
 // By id; nodes stay put, so the strings handed out stay valid.
-std::unordered_map<uint32_t, Capitalized> g_capitalized;
+std::unordered_map<uint32_t, Shown> g_shown;
 
 std::wstring Capitalize(std::wstring text) {
     bool wordStart = true;
@@ -63,6 +76,21 @@ std::wstring Capitalize(std::wstring text) {
     return text;
 }
 
+std::wstring Transform(uint32_t id, std::wstring text) {
+    for (const auto& [from, to] : Replacements()) {
+        for (size_t at = text.find(from); at != std::wstring::npos; at = text.find(from, at + to.size())) {
+            text.replace(at, from.size(), to);
+        }
+    }
+    return CapitalizedIds().count(id) ? Capitalize(std::move(text)) : text;
+}
+
+const GameString* GameTextString(uint32_t id) {
+    using ManagerFn = void*(__cdecl*)();
+    void* manager = reinterpret_cast<ManagerFn>(0x006728c0)();
+    return manager ? static_cast<const GameString*>(TextManager_GetText_original(manager, nullptr, id)) : nullptr;
+}
+
 } // namespace
 
 uint32_t RegisterText(const wchar_t* text) {
@@ -75,11 +103,29 @@ uint32_t RegisterText(const wchar_t* text) {
 void CapitalizeText(uint32_t id) {
     std::lock_guard guard(g_lock);
     CapitalizedIds().insert(id);
+    g_shown.erase(id);
+}
+
+void ReplaceInTexts(const std::wstring& from, const std::wstring& to) {
+    if (from.empty() || from == to) {
+        return;
+    }
+    std::lock_guard guard(g_lock);
+    for (const auto& replacement : Replacements()) {
+        if (replacement.first == from) {
+            return;
+        }
+    }
+    Replacements().emplace_back(from, to);
+    g_shown.clear();
+}
+
+std::wstring GameText(uint32_t id) {
+    const GameString* string = GameTextString(id);
+    return string && string->begin && string->end > string->begin ? std::wstring(string->begin, string->end)
+                                                                    : std::wstring();
 }
 
-// GetText (0x672f70, ret 4): (id) -> string; ours first.
-const void* __fastcall TextManager_GetText(void* self, void* edx, uint32_t id);
-RE_HOOK(0x00672f70, TextManager_GetText);
 const void* __fastcall TextManager_GetText(void* self, void* edx, uint32_t id) {
     if (id >= kFirstOwnText && id < 0x80000000) {
         std::lock_guard guard(g_lock);
@@ -90,22 +136,23 @@ const void* __fastcall TextManager_GetText(void* self, void* edx, uint32_t id) {
     }
     const void* original = TextManager_GetText_original(self, edx, id);
     std::lock_guard guard(g_lock);
-    if (!original || !CapitalizedIds().count(id)) {
+    if (!original || (Replacements().empty() && !CapitalizedIds().count(id))) {
         return original;
     }
     const auto* string = static_cast<const GameString*>(original);
     if (!string->begin || string->end <= string->begin) {
         return original;
     }
-    Capitalized& entry = g_capitalized[id];
-    if (entry.source.compare(0, std::wstring::npos, string->begin, string->end - string->begin) != 0 ||
-        entry.text.empty()) {
+    Shown& entry = g_shown[id];
+    if (entry.text.empty() ||
+        entry.source.compare(0, std::wstring::npos, string->begin, string->end - string->begin) != 0) {
         entry.source.assign(string->begin, string->end);
-        entry.text = Capitalize(entry.source);
+        entry.text = Transform(id, entry.source);
+        entry.changed = entry.text != entry.source;
         const wchar_t* text = entry.text.c_str();
         entry.string = {text, text + entry.text.size(), text + entry.text.size()};
     }
-    return &entry.string;
+    return entry.changed ? &entry.string : original;
 }
 
 } // namespace game