Align input graphical selection docs

[forntoh]

Summary

• always clear graphical value selection after input item rendering
• remove stale implementation-specific input graphical docs/comments
• strengthen LcdMenu input graphical selection coverage to verify selection set/clear behavior

Checks

• git diff --check
• clang-format --dry-run --Werror src/ItemInput.h src/ItemInputCharset.h test/LcdMenu.cpp
• pio run -e esp32
• make html (from docs/; succeeded with existing unrelated warnings)

Notes

• focused pio test path remains blocked locally by missing ArduinoUnitTests.h / Godmode.h in the current PlatformIO test harness
• intentionally skipped snapshot deletions in test/ItemValue.cpp as low-value/unrelated to this bundle
• only scoped input headers, item docs pages, and test/LcdMenu.cpp are included

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