feat(FN-3079): add plugin dashboard views and dependency graph plugin

- Add plugin dashboard view registration and hosting across core, dashboard routes, and plugin SDK exports
- Integrate plugin-provided views into app navigation, mobile/header UI, and view state hooks with coverage
- Add fusion-plugin-dependency-graph example plugin with persisted storage, dashboard view UI, and manifest wiring
- Update plugin authoring and architecture docs for dashboard view extension points
- Add a changeset for @runfusion/fusion covering plugin dashboard view support

Fusion-Task-Id: FN-3079

packages/plugin-sdk/src/__tests__/index.test.ts

@@ -240,6 +240,22 @@ describe("Plugin SDK", () => {
     });
   });
 
+
+
+    it("PluginDashboardViewDefinition can be used in FusionPlugin", () => {
+      const plugin: FusionPlugin = {
+        manifest: { id: "test", name: "Test", version: "1.0.0" },
+        state: "installed",
+        hooks: {},
+        tools: [],
+        routes: [],
+        dashboardViews: [
+          { viewId: "graph", label: "Graph", componentPath: "./views/Graph.js", placement: "more" },
+        ],
+      };
+      expect(plugin.dashboardViews).toHaveLength(1);
+      expect(plugin.dashboardViews?.[0].viewId).toBe("graph");
+    });
   // ── validatePluginManifest ───────────────────────────────────────────
 
   describe("validatePluginManifest", () => {

packages/plugin-sdk/src/index.ts

@@ -49,6 +49,7 @@ export type {
   PluginRouteDefinition,
   PluginRouteMethod,
   PluginUiSlotDefinition,
+  PluginDashboardViewDefinition,
   PluginRuntimeManifestMetadata,
   PluginRuntimeFactory,
   PluginRuntimeRegistration,