feat(theme-selector): split C and C++ code samples, add Java

The combined C/C++ preview is now a dedicated C sample and a dedicated C++ sample, plus a new Java sample. Each is tokenized to exercise every syntax category the language actually has: C++ hits all 19 (including [[nodiscard]] attributes, a std::regex raw string, and a Doxygen doc comment); C hits 18 (no regex literal exists in C); Java hits 17 (no preprocessor and no global builtins). C also gained a doc comment and a __attribute__ decorator over the old combined sample.

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