Fix sidecar not found on Windows/macOS/Linux: switch from externalBin to resources

Tauri's externalBin only bundled the single sidecar executable, but
PyInstaller's onedir output requires companion DLLs and _internal/.
The binary was also renamed with a target triple suffix that
resolve_sidecar_path() didn't look for, causing it to fall back to
dev mode which used a compile-time CI path (CARGO_MANIFEST_DIR).

- Switch from externalBin to bundle.resources to include all sidecar files
- Pass Tauri resource_dir to sidecar manager for platform-aware path resolution
- Remove rename_binary() since externalBin target triple naming is no longer needed
- Remove broken production-to-dev fallback that could never work on user machines

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build-macos.yml

@@ -41,9 +41,8 @@ jobs:
 
       - name: Place sidecar for Tauri
         run: |
-          mkdir -p src-tauri/binaries
-          cp -r python/dist/voice-to-notes-sidecar/* src-tauri/binaries/
-          chmod +x src-tauri/binaries/voice-to-notes-sidecar-${{ env.TARGET }}
+          cp -r python/dist/voice-to-notes-sidecar src-tauri/sidecar
+          chmod +x src-tauri/sidecar/voice-to-notes-sidecar
 
       # ── Tauri app ──
       - name: Set up Node.js
@@ -65,7 +64,7 @@ jobs:
       - name: Build Tauri app
         run: npm run tauri build
         env:
-          TAURI_CONFIG: '{"bundle":{"externalBin":["binaries/voice-to-notes-sidecar"]}}'
+          TAURI_CONFIG: '{"bundle":{"resources":["sidecar/**"]}}'
 
       # ── Release ──
       - name: Upload to release