feat: deep linking for hosted URLs and openconcho:// scheme

Add /explore redirect route that maps Honcho's deep-link shape
(?workspace=...&view=...&session=...) onto our existing flat routes,
so any app.honcho.dev URL works against a self-hosted instance by
swapping the host.

Wire tauri-plugin-deep-link to register the openconcho:// scheme on
desktop and forward incoming URLs into the router on launch and at
runtime.

packages/web/src/main.tsx

@@ -3,6 +3,7 @@ import { createRouter, RouterProvider } from "@tanstack/react-router";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import { DemoProvider } from "./context/DemoContext";
+import { initDeepLinks } from "./lib/deep-link";
 import { routeTree } from "./routeTree.gen";
 import "./index.css";
 
@@ -27,6 +28,8 @@ declare module "@tanstack/react-router" {
 	}
 }
 
+void initDeepLinks(router as never);
+
 const root = document.getElementById("root");
 if (!root) throw new Error("Missing #root element");