Fix Rust formatting and clippy issues

- Apply cargo fmt to decoder/mod.rs
- Fix clippy manual_flatten warning in build.rs by using .flatten()

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: cfsmp3

src/rust/build.rs

@@ -103,14 +103,11 @@ fn main() {
             if std::path::Path::new(cellar_ffmpeg).exists() {
                 // Find the FFmpeg version directory
                 if let Ok(entries) = std::fs::read_dir(cellar_ffmpeg) {
-                    for entry in entries {
-                        if let Ok(entry) = entry {
-                            let include_path = entry.path().join("include");
-                            if include_path.exists() {
-                                builder =
-                                    builder.clang_arg(format!("-I{}", include_path.display()));
-                                break;
-                            }
+                    for entry in entries.flatten() {
+                        let include_path = entry.path().join("include");
+                        if include_path.exists() {
+                            builder = builder.clang_arg(format!("-I{}", include_path.display()));
+                            break;
                         }
                     }
                 }

src/rust/src/decoder/mod.rs

@@ -517,10 +517,7 @@ impl DtvccRust {
             if let Some(decoder) = &mut self.decoders[i] {
                 // Check if there's content to flush: either cc_count > 0 (already printed)
                 // or any window has visible content (needs to be printed during flush)
-                let has_visible_windows = decoder
-                    .windows
-                    .iter()
-                    .any(|w| is_true(w.visible));
+                let has_visible_windows = decoder.windows.iter().any(|w| is_true(w.visible));
                 if decoder.cc_count > 0 || has_visible_windows {
                     self.flush_decoder(i);
                 }