Strip legacy save/settings systems for a unified savemanager rewrite; split uielement list out of uielement.c

Removes the per-platform save/savestream/autosave implementations, the settings UI frames, and the autosave overlay, replacing them with a savemanager.c/h + savefile.h/savedevice.h scaffold to build the new save system on top of. Also separates the concrete UI_ELEMENTS registration into uielementlist.h/.c so uielement.c only holds the generic per-element lifecycle logic.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/duskpsp/system/systemplatform.h

@@ -9,4 +9,5 @@
 #include "system/systempsp.h"
 
 #define systemInitPlatform systemInitPSP
-#define systemGetActiveDialogTypePlatform systemGetActiveDialogTypePSP
+#define systemGetActiveDialogTypePlatform systemGetActiveDialogTypePSP
+#define systemGetLocalePlatform systemGetLocalePSP

src/duskpsp/system/systempsp.c

@@ -61,4 +61,12 @@ int_t systemPSPGetCrossButtonSetting() {
   return (
     ret == 1 ? PSP_UTILITY_ACCEPT_CROSS : PSP_UTILITY_ACCEPT_CIRCLE
   );
+}
+
+const localeinfo_t * systemGetLocalePSP(void) {
+  switch(systemPSPGetLanguage()) {
+    case PSP_SYSTEMPARAM_LANGUAGE_JAPANESE: return &LOCALE_INFO_JP_JP;
+    case PSP_SYSTEMPARAM_LANGUAGE_SPANISH: return &LOCALE_INFO_ES_MX;
+    default: return &LOCALE_DEFAULT;
+  }
 }

src/duskpsp/system/systempsp.h

@@ -37,4 +37,12 @@ int_t systemPSPGetLanguage();
  * 
  * @return PSP_UTILITY_ACCEPT_CROSS or PSP_UTILITY_ACCEPT_CIRCLE.
  */
-int_t systemPSPGetCrossButtonSetting();
+int_t systemPSPGetCrossButtonSetting();
+
+/**
+ * Returns the locale matching the system's configured language, falling
+ * back to LOCALE_DEFAULT if the system language has no matching locale.
+ *
+ * @return The current locale.
+ */
+const localeinfo_t * systemGetLocalePSP(void);