style(teensy): rustfmt flash.rs — unblock the Formatting CI gate

[zackees]

The Formatting workflow (soldr cargo fmt --all -- --check) has been red on main since #968 (760b40b), which merged an unformatted .map(...).unwrap_or_default() chain in crates/fbuild-deploy/src/teensy/flash.rs:125. That fails the Formatting check on every PR opened since.

cargo fmt --all reformats the one chain across lines; cargo fmt --all -- --check is now clean (0 diffs). No behavior change — whitespace only.

Diff in .../teensy/flash.rs:125:
-            flash_cwd.map(|p| p.display().to_string()).unwrap_or_default()
+            flash_cwd
+                .map(|p| p.display().to_string())
+                .unwrap_or_default()

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between e8eca79 and 3bf39d8.

📒 Files selected for processing (1)

• crates/fbuild-deploy/src/teensy/flash.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/fmt-main

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