feat(docs): add new functions for opening and deep linking to the Reticulum manual in the documentation navigation

meshchatx/src/frontend/js/reticulumDocsEntryUrl.js

@@ -1,3 +1,12 @@
+/**
+ * Relative path under /reticulum-docs/ for the Interfaces manual section on
+ * bootstrap_only and related options (Common Interface Options).
+ */
+export const RETICULUM_MANUAL_INTERFACES_COMMON_OPTIONS_REL = "manual/interfaces.html#common-interface-options";
+
+/** Interfaces manual overview (directory of interface types). */
+export const RETICULUM_MANUAL_INTERFACES_OVERVIEW_REL = "manual/interfaces.html";
+
 /**
  * Locales that ship a localized root index (index_<locale>.html) in the
  * Reticulum website bundle. The Sphinx manual itself is English-only under

meshchatx/src/frontend/js/reticulumDocsNavigation.js

@@ -0,0 +1,27 @@
+import { RETICULUM_MANUAL_INTERFACES_COMMON_OPTIONS_REL } from "./reticulumDocsEntryUrl.js";
+
+/**
+ * Open the in-app documentation tool to a path under /reticulum-docs/.
+ * @param {import('vue-router').Router} router
+ * @param {string} [relPath] - path after /reticulum-docs/ (may include #fragment)
+ */
+export function openBundledReticulumManualPath(router, relPath = RETICULUM_MANUAL_INTERFACES_COMMON_OPTIONS_REL) {
+    return router.push({
+        name: "documentation",
+        query: { reticulum: encodeURIComponent(relPath) },
+    });
+}
+
+/**
+ * Host-agnostic deep link for the bundled Reticulum manual (handled in App.vue
+ * `handleProtocolLink`). Use in LXMF, notifications, or when the browser base URL is unknown.
+ * @param {string} relPath - path under /reticulum-docs/ (e.g. `manual/interfaces.html#section`)
+ * @param {"meshchatx" | "meshchat"} [scheme=meshchatx]
+ * @returns {string} e.g. `meshchatx://docs?reticulum=manual%2Finterfaces.html`
+ */
+export function bundledReticulumManualDeepLink(relPath, scheme = "meshchatx") {
+    const s = scheme === "meshchat" ? "meshchat" : "meshchatx";
+    const q = new URLSearchParams();
+    q.set("reticulum", relPath);
+    return `${s}://docs?${q.toString()}`;
+}