v4.0.0-beta6

• New hx-multipart extension: stream multipart/mixed and multipart/parallel responses, with per-part HX-* action headers
• History scroll restoration via the Navigation API, with a Firefox fallback (#3905)
• HCON is now exposed to extensions (#3879)
• Support for custom request methods like query (#3892, #3883)
• Breaking: renamed event htmx:swap:finally to htmx:finally:swap (#3873)
• HX-Trigger response-header events now fire after swap (#3900)
• hx-live performance: skip no-change updates (#3891), cache compiled safeEval tags (#3888)
• hx-ws: forward protocols to the WebSocket constructor (#3874); rewritten/refined implementation
• optimistic extension handles trusted-type policies via cloneNode (#3887)
• Custom-element manual input value collection (#3872)
• Many smaller fixes and a website overhaul