chore: bump cinny submodule to 66cc51d6

CreateDIBSection does not guarantee zeroed memory. Uninitialized bytes
with non-zero RGB but zero alpha were getting alpha=255 set by the
existing pixel loop, causing a black square around the badge circle.
Zeroing with write_bytes before GDI drawing ensures only explicitly
painted pixels are opaque.

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

.gitea/workflows/release.yml

@@ -88,7 +88,16 @@ jobs:
           CARGO_HTTP_MULTIPLEXING: 'false'
           # Retry transient network errors before failing.
           CARGO_NET_RETRY: '5'
-        run: npm run tauri -- build --bundles nsis
+        run: |
+          # USERPROFILE is set by Windows directly; more reliable than C:\Users\$USERNAME
+          $env:PATH = "$env:USERPROFILE\.cargo\bin;$env:PATH"
+          # Also add the actual toolchain bin to bypass rustup shim execution issues
+          $toolchain = Get-ChildItem "$env:USERPROFILE\.rustup\toolchains" -Directory -ErrorAction SilentlyContinue |
+                       Where-Object { $_.Name -match 'stable' } | Select-Object -First 1
+          if ($toolchain) { $env:PATH = "$($toolchain.FullName)\bin;$env:PATH" }
+          Write-Host "cargo: $((Get-Command cargo -ErrorAction SilentlyContinue).Source)"
+          cargo --version
+          npm run tauri -- build --bundles nsis
 
       - name: Upload to release
         shell: powershell

src-tauri/src/lib.rs

@@ -182,6 +182,11 @@ fn set_badge_count(count: u32, window: tauri::Window) -> Result<(), String> {
                 let hbm_color =
                     CreateDIBSection(Some(hdc), &bmi, DIB_RGB_COLORS, &mut bits, None, 0)
                         .map_err(|e| e.to_string())?;
+                // Zero-init so undrawn pixels are fully transparent (CreateDIBSection
+                // does not guarantee zeroed memory; garbage bytes cause a black square).
+                if !bits.is_null() {
+                    std::ptr::write_bytes(bits as *mut u8, 0, (size * size * 4) as usize);
+                }
                 let old_bm = SelectObject(hdc, hbm_color.into());
 
                 let hbrush = CreateSolidBrush(COLORREF(0x003030DD));