build: embed ui.toml and banlist with INCBIN instead of a configure loop

ui.toml and the default banlist were embedded by a CMake function that
read each file and emitted a C array header one byte at a time in a
configure-time loop. That is slow to configure, and because the result
is a header, editing either resource recompiled every translation unit
that included it.

- Both files are now embedded with INCBIN from a small generated
  translation unit, the same pattern already used for the fonts. There
  is no generated header, so editing a resource re-assembles one tiny
  object file instead of triggering a wide recompile, and configure does
  no per-byte work.
- Consumers include a hand-written header declaring the symbols and
  always use the embedded data (the __has_include fallback is gone). The
  data is not NUL-terminated, so every consumer passes an explicit size.
- The old EmbedResources.cmake script is removed, and the generated unit
  is added to the app and test builds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cmake/EmbedResources.cmake

@@ -1,42 +0,0 @@
-# CMake script to embed binary files as C arrays
-
-function(embed_resource RESOURCE_FILE OUTPUT_FILE VAR_NAME)
-    file(READ "${RESOURCE_FILE}" HEX_CONTENT HEX)
-    
-    # Convert hex to C array format
-    string(LENGTH "${HEX_CONTENT}" HEX_LENGTH)
-    math(EXPR BYTE_COUNT "${HEX_LENGTH} / 2")
-    
-    set(ARRAY_CONTENT "")
-    set(INDEX 0)
-    while(INDEX LESS HEX_LENGTH)
-        string(SUBSTRING "${HEX_CONTENT}" ${INDEX} 2 BYTE)
-        string(APPEND ARRAY_CONTENT "0x${BYTE},")
-        math(EXPR INDEX "${INDEX} + 2")
-        math(EXPR BYTE_NUM "${INDEX} / 2")
-        math(EXPR MOD "${BYTE_NUM} % 16")
-        if(MOD EQUAL 0)
-            string(APPEND ARRAY_CONTENT "\n    ")
-        endif()
-    endwhile()
-    
-    # Generate header file
-    set(HEADER_CONTENT "// Auto-generated embedded resource - DO NOT EDIT
-#pragma once
-#include <cstddef>
-#include <cstdint>
-
-namespace embedded {
-
-inline constexpr unsigned char ${VAR_NAME}_data[] = {
-    ${ARRAY_CONTENT}
-};
-
-inline constexpr size_t ${VAR_NAME}_size = ${BYTE_COUNT};
-
-} // namespace embedded
-")
-    
-    file(WRITE "${OUTPUT_FILE}" "${HEADER_CONTENT}")
-    message(STATUS "Embedded ${RESOURCE_FILE} -> ${OUTPUT_FILE} (${BYTE_COUNT} bytes)")
-endfunction()