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>

.gitea/workflows/build-release.yml

@@ -161,10 +161,10 @@ jobs:
 
       - name: Set app version from tag
         run: |
-          REF="${GITHUB_REF#refs/tags/v}"
-          VERSION="${REF#refs/heads/}"
-          # On non-tag runs keep whatever is in tauri.conf.json
+          # On a tag build, the tag is the single source of truth for the
+          # version name. On non-tag runs keep whatever is in tauri.conf.json.
           if echo "$GITHUB_REF" | grep -q '^refs/tags/v'; then
+            VERSION="${GITHUB_REF#refs/tags/v}"
             echo "Setting version to $VERSION"
             sed -i "s/\"version\": \"[^\"]*\"/\"version\": \"$VERSION\"/" src-tauri/tauri.conf.json
           fi
@@ -173,6 +173,30 @@ jobs:
       - name: Initialize Android project
         run: bun run tauri android init
 
+      - name: Pin a monotonic Android versionCode
+        run: |
+          # `tauri android init` autogenerates src-tauri/gen/android/app/tauri.properties
+          # with a versionCode derived from the semver (e.g. 0.0.15 -> 15). That
+          # number is (a) tiny and (b) NOT monotonic across our history: earlier
+          # local/dev builds shipped versionCode 1000 (from a 0.1.0 config), so a
+          # plain 15 would be a *downgrade* and Android would refuse the update.
+          #
+          # Derive an explicit code that is both monotonic in semver order and
+          # always above the 1000 floor already in the field:
+          #   code = 1000 + major*10000 + minor*100 + patch
+          # e.g. 0.0.15 -> 1015, 0.1.0 -> 11000, 1.0.0 -> 1010000.
+          PROPS="src-tauri/gen/android/app/tauri.properties"
+          VERSION=$(grep '"version"' src-tauri/tauri.conf.json | sed -E 's/.*"version"\s*:\s*"([^"]+)".*/\1/')
+          IFS='.' read -r MAJ MIN PAT <<< "$VERSION"
+          CODE=$(( 1000 + MAJ*10000 + MIN*100 + PAT ))
+          echo "version=$VERSION -> versionCode=$CODE"
+          if grep -q '^tauri.android.versionCode=' "$PROPS"; then
+            sed -i "s/^tauri.android.versionCode=.*/tauri.android.versionCode=$CODE/" "$PROPS"
+          else
+            echo "tauri.android.versionCode=$CODE" >> "$PROPS"
+          fi
+          cat "$PROPS"
+
       - name: Sync custom Android sources & gradle config
         run: ./scripts/sync-android-sources.sh