Return an error for truncated subs codec parameters

[kixelated]

Split from #199. Refs #179.

What changed

• Decode the four-byte subs codec-specific parameters through the checked decoding path.
• Add a regression test for a three-byte truncated value.

Why

The previous decoder sliced and advanced four bytes without first verifying that four bytes remained, so malformed input could panic.

Impact

Truncated subs data now returns Error::OutOfBounds; valid decoding is unchanged.

Validation

• cargo fmt --all -- --check
• cargo test --all-features (251 unit tests and 3 doctests passed)
• cargo clippy --all-targets --all-features -- -D warnings
• git diff --check main...HEAD

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 371ed0af-3f1e-44c0-ab3a-70f4c426ecbe

📥 Commits

Reviewing files that changed from the base of the PR and between 2a28308 and c9b0001.

📒 Files selected for processing (1)

• src/moov/trak/mdia/minf/stbl/subs.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-179-subs

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