feat: Full UI internationalization, pool hashrate stats, and layout caching

- Replace all hardcoded English strings with TR() translation keys across
  every tab, dialog, and component (~20 UI files)
- Expand all 8 language files (de, es, fr, ja, ko, pt, ru, zh) with
  complete translations (~37k lines added)
- Improve i18n loader with exe-relative path fallback and English base
  fallback for missing keys
- Add pool-side hashrate polling via pool stats API in xmrig_manager
- Introduce Layout::beginFrame() per-frame caching and refresh balance
  layout config only on schema generation change
- Offload daemon output parsing to worker thread
- Add CJK subset fallback font for Chinese/Japanese/Korean glyphs

CMakeLists.txt

@@ -481,17 +481,36 @@ elseif(EXISTS ${CMAKE_SOURCE_DIR}/../SilentDragonX/res/Ubuntu-R.ttf)
     )
 endif()
 
-# Copy language files
+# Copy language files at BUILD time (not just cmake configure time)
+# so edits to res/lang/*.json are picked up by 'make' without re-running cmake.
 file(GLOB LANG_FILES ${CMAKE_SOURCE_DIR}/res/lang/*.json)
 if(LANG_FILES)
     foreach(LANG_FILE ${LANG_FILES})
         get_filename_component(LANG_FILENAME ${LANG_FILE} NAME)
-        configure_file(
-            ${LANG_FILE}
-            ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/res/lang/${LANG_FILENAME}
-            COPYONLY
+        add_custom_command(
+            OUTPUT ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/res/lang/${LANG_FILENAME}
+            COMMAND ${CMAKE_COMMAND} -E copy_if_different
+                ${LANG_FILE}
+                ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/res/lang/${LANG_FILENAME}
+            DEPENDS ${LANG_FILE}
+            COMMENT "Copying ${LANG_FILENAME}"
         )
+        list(APPEND LANG_OUTPUTS ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/res/lang/${LANG_FILENAME})
+
+        # Also regenerate the embedded header so the binary always has fresh translations
+        get_filename_component(LANG_CODE ${LANG_FILENAME} NAME_WE)
+        set(LANG_HEADER ${CMAKE_SOURCE_DIR}/src/embedded/lang_${LANG_CODE}.h)
+        add_custom_command(
+            OUTPUT ${LANG_HEADER}
+            COMMAND xxd -i "res/lang/${LANG_FILENAME}" > "src/embedded/lang_${LANG_CODE}.h"
+            DEPENDS ${LANG_FILE}
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+            COMMENT "Embedding lang_${LANG_CODE}.h"
+        )
+        list(APPEND LANG_OUTPUTS ${LANG_HEADER})
     endforeach()
+    add_custom_target(copy_langs ALL DEPENDS ${LANG_OUTPUTS})
+    add_dependencies(ObsidianDragon copy_langs)
     message(STATUS "  Language files: ${LANG_FILES}")
 endif()