Rename _type to loc_type in resolve_with_default

[Copilot]

The variable _type in resolve_with_default used a leading underscore, which in Rust conventionally signals an intentionally unused variable — misleading since it's actively used in the match arm and error message.

• src/config.rs: Rename _type → loc_type in the destructured tuple and its two usage sites within resolve_with_default

// Before
let (_type, url, selector) = canonical_location;
match _type.as_ref() { ... }

// After
let (loc_type, url, selector) = canonical_location;
match loc_type.as_ref() { ... }

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