test: set core.autocrlf=false in init_repo to fix CRLF mismatch

[cst8t]

Motivation

• Prevent Git on Windows from normalizing LF to CRLF during test patch application by disabling core.autocrlf for repositories created by the test helper.

Description

• Add git(path, &["config", "core.autocrlf", "false"]); to init_repo() in src-tauri/tests/git.rs so test repos keep Unix line endings.

Testing

• Ran cargo test --manifest-path src-tauri/Cargo.toml import_patch_applies_to_working_tree, which was blocked by a missing system dependency (glib-2.0 / pkg-config) and could not complete.
• Ran cargo fmt --manifest-path src-tauri/Cargo.toml --check, which reported unrelated rustfmt diffs in the repository.
• Ran git diff --check, which reported no issues.

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Codex Task