Security vulnerabilities and automated fixes for homoglyph issues
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The `sanitizeUnicodeInput()` helper used by the project character-range settings screen rewrote `U+` prefixes to `0x` and called `parseInt()`, but never normalized its argument first. Compatibility-equivalent forms such as fullwidth `Ｕ＋`, superscript digits, or mathematical alphanumerics never matched the `/U\+/gi` regex, fell through to the `else return inputString` branch, and were handed back to callers verbatim as "sanitized" values. The fix inserts a `String.prototype.normalize('NFKC')` pas