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/components/library/GenericGenreBrowser.svelte

@@ -3,7 +3,7 @@
   import { page } from "$app/stores";
   import { truncateMiddle } from "$lib/utils/truncateMiddle";
   import { goto } from "$app/navigation";
-  import { navigateBack } from "$lib/utils/navigation";
+  import { navigateUp } from "$lib/utils/navigation";
   import { currentLibrary } from "$lib/stores/library";
   import { auth } from "$lib/stores/auth";
   import SearchBar from "$lib/components/common/SearchBar.svelte";
@@ -138,7 +138,7 @@
       selectedGenre = null;
       genreItems = [];
     } else {
-      navigateBack(config.backPath);
+      navigateUp(config.backPath);
     }
   }
 

src/lib/components/library/GenericMediaListPage.svelte

@@ -3,7 +3,7 @@
   import { onMount, onDestroy } from "svelte";
   import { listen, type UnlistenFn } from "@tauri-apps/api/event";
   import { goto } from "$app/navigation";
-  import { navigateBack } from "$lib/utils/navigation";
+  import { navigateUp } from "$lib/utils/navigation";
   import { currentLibrary } from "$lib/stores/library";
   import { auth } from "$lib/stores/auth";
   import { shouldShowAudioMiniPlayer } from "$lib/stores/player";
@@ -176,7 +176,7 @@
   }
 
   function goBack() {
-    navigateBack(config.backPath);
+    navigateUp(config.backPath);
   }
 
   const searchPlaceholder = $derived(config.searchPlaceholder || `Search ${config.title.toLowerCase()}...`);