refactor(log): migra els subsistemes restants i elimina iostream

Acaba la migració dels std::cout/cerr a Log::*:

- core/locale, core/ui/ui_config, core/rendering/{screen,text,gif,
  surface, sprite/animated_sprite, sdl3gpu/*}.
- game/{options, debug_config, editor/editor_config, levels/level_manager,
  map/{map,tilemap,paint_layer}, entities/entity_manager_loadlevel}.

Severitats coherents: warns per a configs absents amb fallback,
errors per a YAML malformat o E/S fallida, infos per a estats.

Resultat:
- 0 occurrences de std::cout/std::cerr a source/.
- Cap #include <iostream> orfà (eliminat de surface.cpp).
- Output funcional idèntic al històric; AEE_LOG filtra (ex.
  `AEE_LOG=warn` només mostra warnings, `AEE_LOG=*:warn,Tag:info`
  combina globals i overrides).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

source/core/ui/ui_config.cpp

@@ -1,6 +1,5 @@
 #include "core/ui/ui_config.hpp"
 
-#include <iostream>
 #include <string>
 #include <string_view>
 #include <unordered_map>
@@ -9,6 +8,7 @@
 #include "external/fkyaml_node.hpp"
 #include "utils/defaults.hpp"
 #include "utils/easing.hpp"
+#include "utils/log.hpp"
 
 namespace {
 
@@ -27,7 +27,7 @@ namespace {
         if (!node.contains(key)) { return; }
         const int VALUE = node[key].get_value<int>();
         if (VALUE < 0 || VALUE > 255) {
-            std::cerr << "UiConfig: índex '" << key << "'=" << VALUE << " fora de rang 0..255 — ignorat\n";
+            Log::warn("UiConfig", "índex '{}'={} fora de rang 0..255 — ignorat", key, VALUE);
             return;
         }
         dst = static_cast<Uint8>(VALUE);
@@ -183,7 +183,7 @@ auto UiConfig::curveByName(const std::string& name) -> CurveFn {
     const auto& reg = curveRegistry();
     const auto IT = reg.find(name);
     if (IT == reg.end()) {
-        std::cerr << "UiConfig: corba '" << name << "' desconeguda — s'usa linear\n";
+        Log::warn("UiConfig", "corba '{}' desconeguda — s'usa linear", name);
         return &Easing::linear;
     }
     return IT->second;
@@ -192,7 +192,7 @@ auto UiConfig::curveByName(const std::string& name) -> CurveFn {
 void UiConfig::load(const std::string& file_path) {
     auto bytes = Resource::Helper::loadFile(file_path);
     if (bytes.empty()) {
-        std::cerr << "UiConfig: no s'ha pogut obrir " << file_path << " — s'usaran els defaults compilats\n";
+        Log::warn("UiConfig", "no s'ha pogut obrir {} — s'usaran els defaults compilats", file_path);
         return;
     }
 
@@ -345,8 +345,8 @@ void UiConfig::load(const std::string& file_path) {
             readCurve(n, "slide_out_curve", notifier_.slide_out_curve);
         }
 
-        std::cout << "UiConfig: carregat des de " << file_path << '\n';
+        Log::info("UiConfig", "carregat des de {}", file_path);
     } catch (const std::exception& e) {
-        std::cerr << "UiConfig: error parsejant " << file_path << ": " << e.what() << '\n';
+        Log::error("UiConfig", "error parsejant {}: {}", file_path, e.what());
     }
 }