chore(deps): use grass_compiler directly

[m4tx]

For our purposes, grass essentially re-exports grass_compiler. We can therefore skip one extra dependency and use grass_compiler instead.

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

[Copilot]

Pull request overview

This PR simplifies the cot crate’s SCSS build pipeline by removing the grass wrapper dependency and using grass_compiler directly, reducing one level of indirection in the workspace dependencies.

Changes:

• Replace grass with grass_compiler in workspace dependencies and cot’s build-dependencies.
• Update cot/build.rs to call grass_compiler::from_path and use grass_compiler::{Options, OutputStyle}.
• Refresh Cargo.lock to remove the grass package entry and related dependency edge.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
cot/Cargo.toml	Switch build-dependency to grass_compiler and update cargo-machete ignore comment accordingly.
cot/build.rs	Update build script to call grass_compiler APIs directly for SCSS compilation.
Cargo.toml	Replace workspace dependency grass with grass_compiler.
Cargo.lock	Remove the resolved grass package and update dependency graph to grass_compiler.

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[github-actions]

Bencher Report

Branch	grass_compiler
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result milliseconds (ms) (Result Δ%)	Upper Boundary milliseconds (ms) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	6.71 ms (+12.06%) Baseline: 5.99 ms	7.21 ms (93.09%)
json_api/json_api	📈 view plot 🚷 view threshold	1.19 ms (+14.98%) Baseline: 1.04 ms	1.21 ms (98.70%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	1.10 ms (+14.96%) Baseline: 0.96 ms	1.11 ms (99.34%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	1.06 ms (+16.01%) Baseline: 0.92 ms	1.07 ms (99.77%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	17.04 ms (-3.28%) Baseline: 17.62 ms	21.12 ms (80.70%)

🐰 View full continuous benchmarking report in Bencher