Add non-ambiguous characters checkbox to password generator

[Copilot]

Adds a "Non-ambiguous characters" option to the standard password mode that excludes visually similar characters (0, O, o, 1, l, I) from the generated password.

Changes

• index.html: New checkbox under Symbols in the Characters section
• script.js:
  • ambiguousChars = "0Oo1lI" — defines the excluded set
  • filterAmbiguous() helper inside generatePassword filters any character pool when params.nonAmbiguous is true
  • Applied to all character sets (lowercase, uppercase, digits, symbols)
  • nonAmbiguous: false added to default params; checkbox wired up with event listener

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add checkbox for non-ambiguous characters</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add checkbox for non-ambiguous characters #3

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