feat(FN-1090): add Capacitor mobile setup for dashboard

- Add Capacitor dependencies and dashboard scripts for sync, open, run, and mobile preparation
- Add a typed dashboard capacitor.config.ts with dist/client webDir and FUSION_BACKEND_URL server override
- Add Vitest coverage for Capacitor config shape, app identity, webDir, cleartext mode, and env URL behavior
- Ignore generated iOS/Android platform directories and document the end-to-end mobile workflow in the dashboard README

packages/dashboard/src/__tests__/capacitor-config.test.ts

@@ -0,0 +1,60 @@
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+import { describe, it, expect } from "vitest";
+import type { CapacitorConfig } from "@capacitor/cli";
+
+const configPath = resolve(__dirname, "../../capacitor.config.ts");
+
+function evaluateConfig(env: NodeJS.ProcessEnv = {}): CapacitorConfig {
+  const content = readFileSync(configPath, "utf8");
+  const executableSource = content
+    .replace('import type { CapacitorConfig } from "@capacitor/cli";\n\n', "")
+    .replace("const config: CapacitorConfig = {", "const config = {")
+    .replace("export default config;", "return config;");
+
+  const fn = new Function("process", executableSource) as (processLike: { env: NodeJS.ProcessEnv }) => CapacitorConfig;
+  return fn({ env });
+}
+
+describe("capacitor.config", () => {
+
+  it("exists and exports a TypeScript Capacitor config", () => {
+    const content = readFileSync(configPath, "utf8");
+
+    expect(content.length).toBeGreaterThan(0);
+    expect(content).toContain("import type { CapacitorConfig } from \"@capacitor/cli\"");
+    expect(content).toContain("const config: CapacitorConfig = {");
+    expect(content).toContain("export default config;");
+  });
+
+  it("sets webDir to dist/client", () => {
+    const config = evaluateConfig();
+    expect(config.webDir).toBe("dist/client");
+  });
+
+  it("uses the expected app identity", () => {
+    const config = evaluateConfig();
+    expect(config.appId).toBe("com.fusion.dashboard");
+    expect(config.appName).toBe("Fusion");
+  });
+
+  it("enables cleartext server access for local development", () => {
+    const config = evaluateConfig();
+    expect(config.server?.cleartext).toBe(true);
+  });
+
+  it("defaults server.url to undefined when FUSION_BACKEND_URL is unset", () => {
+    const config = evaluateConfig({});
+    expect(config.server?.url).toBeUndefined();
+  });
+
+  it("uses FUSION_BACKEND_URL when provided", () => {
+    const config = evaluateConfig({ FUSION_BACKEND_URL: "http://192.168.1.100:4040" });
+    expect(config.server?.url).toBe("http://192.168.1.100:4040");
+  });
+
+  it("references the FUSION_BACKEND_URL env variable in source", () => {
+    const content = readFileSync(configPath, "utf8");
+    expect(content).toContain("process.env.FUSION_BACKEND_URL || undefined");
+  });
+});