Navigation up/back split, faster startup, and CI versionCode fix

Navigation:
- Split conflated "back" into navigateUp (deterministic route parent) and a
  history-safe navigateBack that tracks in-app depth via afterNavigate instead
  of history.length. Fixes the resume-from-background trap where a stale WebView
  stack left the header arrow stuck on the current page.
- /library self-corrects for music/tv/movies (which have dedicated landing
  pages): a leftover currentLibrary no longer forces the inline content-list
  view, so "up"/back shows the libraries overview. Live TV / channels / other
  types still render inline.

Startup (unblock first paint):
- auth.initialize() no longer awaits security-status, player-config, or session
  verification before flipping isInitialized. These run fire-and-forget after the
  session is restored, so the library overview paints without waiting on several
  serial IPC round-trips.

Versioning / CI:
- tauri.conf.json + package.json aligned to 0.0.15 (the tag series had drifted to
  0.1.0, whose formula-derived versionCode 1000 outran the v0.0.x tags).
- Release workflow now pins a monotonic Android versionCode
  (1000 + major*10000 + minor*100 + patch) so tagged builds never downgrade
  below prior installs and always increase in semver order.

Tests: navigation (4), auth (29), playbackMode (23) green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/utils/navigation.test.ts

@@ -1,35 +1,95 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
-import { navigateBack } from "./navigation";
 
 const goto = vi.fn();
+// Capture the afterNavigate callback so tests can simulate navigations and thus
+// drive the in-app depth counter that canGoBack/navigateBack rely on.
+let afterNavigateCb: ((nav: { from: unknown; to: unknown; delta?: number }) => void) | null =
+  null;
 vi.mock("$app/navigation", () => ({
   goto: (...args: unknown[]) => goto(...args),
+  afterNavigate: (cb: (nav: any) => void) => {
+    afterNavigateCb = cb;
+  },
 }));
 
-describe("navigateBack", () => {
+import {
+  navigateUp,
+  navigateBack,
+  canGoBack,
+  registerNavigationTracking,
+  __resetNavigationDepthForTest,
+} from "./navigation";
+
+/** Simulate a SvelteKit navigation to move the depth counter. */
+function nav(opts: { from?: boolean; delta?: number }) {
+  afterNavigateCb?.({
+    from: opts.from === false ? null : {},
+    to: {},
+    delta: opts.delta,
+  });
+}
+
+describe("navigation", () => {
   beforeEach(() => {
     goto.mockClear();
+    // registerNavigationTracking is idempotent; the first call in the suite wins
+    // and wires afterNavigateCb. Ensure it is registered, then reset depth so
+    // each case starts from the entry page (module state persists otherwise).
+    registerNavigationTracking();
+    __resetNavigationDepthForTest();
   });
 
-  it("pops real history when there is in-app history to go back to", () => {
-    const back = vi.fn();
-    vi.spyOn(history, "back").mockImplementation(back);
-    vi.spyOn(history, "length", "get").mockReturnValue(3);
+  describe("navigateUp", () => {
+    it("always goes to the given parent path, never touching history", () => {
+      const back = vi.fn();
+      vi.spyOn(history, "back").mockImplementation(back);
 
-    navigateBack("/library");
+      navigateUp("/library/music");
 
-    expect(back).toHaveBeenCalledOnce();
-    expect(goto).not.toHaveBeenCalled();
+      expect(goto).toHaveBeenCalledWith("/library/music");
+      expect(back).not.toHaveBeenCalled();
+    });
   });
 
-  it("falls back to the given path on a fresh deep-link (no history)", () => {
-    const back = vi.fn();
-    vi.spyOn(history, "back").mockImplementation(back);
-    vi.spyOn(history, "length", "get").mockReturnValue(1);
+  describe("navigateBack / canGoBack", () => {
+    it("falls back to the path when there is no in-app history yet", () => {
+      // Fresh session: only the initial load happened (from == null), so depth
+      // stays at 0 and there is nothing to pop.
+      nav({ from: false });
+      expect(canGoBack()).toBe(false);
 
-    navigateBack("/library/music");
+      const back = vi.fn();
+      vi.spyOn(history, "back").mockImplementation(back);
 
-    expect(goto).toHaveBeenCalledWith("/library/music");
-    expect(back).not.toHaveBeenCalled();
+      navigateBack("/library");
+
+      expect(goto).toHaveBeenCalledWith("/library");
+      expect(back).not.toHaveBeenCalled();
+    });
+
+    it("pops history after a real in-app forward navigation", () => {
+      nav({ from: false }); // initial load
+      nav({}); // navigated deeper within the app
+      expect(canGoBack()).toBe(true);
+
+      const back = vi.fn();
+      vi.spyOn(history, "back").mockImplementation(back);
+
+      navigateBack("/library");
+
+      expect(back).toHaveBeenCalledOnce();
+      expect(goto).not.toHaveBeenCalled();
+    });
+
+    it("does not go below zero when the user backs out to the entry page", () => {
+      nav({ from: false }); // load
+      nav({}); // forward → depth 1
+      nav({ delta: -1 }); // back → depth 0
+      nav({ delta: -1 }); // extra back (e.g. stale delta) must not underflow
+      expect(canGoBack()).toBe(false);
+
+      navigateBack("/library/music");
+      expect(goto).toHaveBeenCalledWith("/library/music");
+    });
   });
 });