fix(cargo-hover): show feature dependency metadata in hover

[ya7010]

Summary

• show feature dependency metadata when hovering dependency feature items in Cargo manifests
• keep default feature lists in the tooltip and render both sections with code formatting
• update hover tests to cover feature dependencies before default features

Validation

• cargo fmt --all --check
• cargo test -p tombi-extension-cargo
• cargo test -p tombi-lsp --test test_hover
• cargo clippy --workspace --all-targets --locked -- -D warnings

[Copilot]

Pull request overview

Updates Cargo hover behavior in the tombi-extension-cargo extension to display feature dependency metadata when hovering dependency feature items, while preserving the default feature list tooltip (now rendered with inline code formatting) and updating hover tests accordingly.

Changes:

• Add dependency feature metadata extraction (feature dependency map + default features) for path and crates.io dependencies and render combined hover tooltips.
• Render both “Feature Dependencies” and “Default Features” sections with code formatting and deterministic ordering for default features.
• Update LSP hover tests to validate feature-dependency section precedence and new formatting.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
extensions/tombi-extension-cargo/src/hover.rs	Adds feature-dependency metadata retrieval and tooltip formatting for dependency feature hovers.
crates/tombi-lsp/tests/test_hover.rs	Updates hover expectations to include feature-dependency metadata and backtick formatting.

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