Version and feature update

[eisnerw]

I've made a significant number of changes to the tool summarized below:

• Upgraded Angular from version 18 to 19.2.14.
• Added optional NOT support for rulesets via the allowNot input.
• Demo layout was revamped and now features a two-way bound JSON editor.
• Editing the JSON textbox updates the query tree and vice versa.
• The JSON editor validates input with lighter red for query errors and darker red for JSON errors.
• Optional buttons allow converting a rule to a ruleset and back with allowConvertToRuleset.
• Optional up/down arrows enable reordering rules when allowRuleUpDown is set.
• Added a customCollapsedSummary callback to display summaries for collapsed rulesets.