chore(daemon): silence unused warnings in the no-wgpu build

[hyperb1iss]

💜 What

Eleven `unused` warnings that only appear when the daemon builds without wgpu — the combo the Windows CI job's daemon-test step uses (`--no-default-features --features builtin-drivers`) — are gated to match their usages. No behavior changes; every edit is a `#[cfg(feature = "wgpu")]` on an import, constant, or bench helper whose only consumers already sit behind that feature.

🔮 Why

None of the Linux gates compile this feature combo, so the warnings live exclusively in the Windows job's log, where they read as new breakage next to unrelated failures. They predate the current PR queue (present on main, visible in every Windows run).

🧪 Verification

`cargo check -p hypercolor-daemon --no-default-features --features builtin-drivers --all-targets` emits zero warnings, and default-features `cargo clippy -p hypercolor-daemon --all-targets` stays clean.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6c038c33-d18c-4fa3-a620-a5406cb51041

📥 Commits

Reviewing files that changed from the base of the PR and between 277ee82 and eae7192.

📒 Files selected for processing (3)

• crates/hypercolor-daemon/benches/render_pipeline.rs
• crates/hypercolor-daemon/src/render_thread/display_lane.rs
• crates/hypercolor-daemon/src/render_thread/render_groups/tests.rs

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