Improve Password Generator Logic and UI

[Amansingh0807]

The password generator has a few bugs and UX issues that need to be fixed:
Off-by-One Error in the password generation logic causing invalid characters to be selected.

• State Synchronization Issue: defaultChecked is being used for checkboxes. It should be checked for proper state syncing.
• Range Input Bug: The value from the range input is a string, which needs to be parsed to an integer before being used for length.
• UI Improvements: Add padding and update the cursor for password input for better UX. The "copy" button and input field should have improved styling.
• Accessibility: Ensure labels have html For to improve accessibility.

Fixes Implementation

• Fixed the off-by-one error in password character selection.
• Replaced defaultChecked with checked for checkbox inputs.
• Corrected range input handling by parsing the value to an integer.
• Enhanced input and button styling for better UX.
• Added htmlFor to labels for accessibility.