Fix input item first character crash

[forntoh]

Summary

• track whether ItemInput owns its value buffer before freeing it
• make default-empty inputs use owned writable storage
• clone external values before mutating them in input and charset edit paths
• add regression coverage for default-empty, static, and stack-backed input values

Verification

• pio run -e esp32 passed
• pio test -e esp32 fails before running tests due missing known harness headers: ArduinoUnitTests.h and Godmode.h
• pio run -e uno fails due existing program/RAM size overflow for the current app build

[coderabbitai]

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• Commit unit tests in branch fix/input-item-first-character-crash

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