Bug Fixes mostly and a couple new features

• Introduced a custom Shiftlock feature, similar to custom cursors. (honestly just copied and pasted code from custom cursors lol)
• Added the ability to convert JSON into flagstate format. (onion wanted it so I added it)
• Switched to 12-hour clocks (AM/PM) instead of 24-hour format in public flag lists for better readability.
• Added GUID validation on ID changes to ensure only valid GUIDs are accepted.
• Improved JSON validator when publishing and editing your flaglists.
• Introduced a 1250-line limit when publishing flags to prevent excessive bulk pasting from FindFlag.
• Enabled text wrapping on titles in the Browse tab so text doesn't go offscreen.
• Fixed duplicate “Import from JSON” button texts by renaming the lower button to "Import from Json text" and the upper one to "Import Json".
• Resolved an issue where Ctrl + Z (undo) did not work reliably unless the editor box was focused.
• Updated the JSON blob display in Browse to use pretty-printed (formatted) JSON.
• Added a total flag count display to each flaglist in the Browse tab.
• Added an optional Author name when publishing flags, editable in Manage, defaults to “unknown” if left empty.
• Enforced maximum length limits for Title and Author name fields.
• Completely reworked the Custom App Theme UI for improved usability.
• Slightly adjusted the bannable FastFlag warning for clarity.
• Fixed numerous spelling mistakes.
• Fixed font consistency in FastFlag page