fix(config): read Windows user-profile config

[benvinegar]

Summary

• fall back to USERPROFILE when HOME is unavailable, preserving Hunk’s documented .config/hunk/config.toml location on Windows
• cover both path resolution and config loading behavior
• add a patch changeset

Closes #522

Testing

• bun test src/core/paths.test.ts src/core/config.test.ts
• bun run typecheck
• bun test (timed out after 120 seconds; all reported tests passed before timeout)

This PR description was generated by Pi using GPT-5

[greptile-apps]

Greptile Summary

This PR fixes global config discovery on Windows by falling back to USERPROFILE when HOME is unset, keeping the existing .config/hunk/config.toml path convention intact. The core change is a single-line || fallback in resolveUserConfigDir, covered by new unit tests in both paths.test.ts and config.test.ts.

• src/core/paths.ts: env.HOME || env.USERPROFILE replaces the HOME-only check, so both resolveGlobalConfigPath and resolveHunkStatePath pick up the right base directory on Windows.
• src/core/paths.test.ts / src/core/config.test.ts: New tests verify the USERPROFILE fallback for raw path resolution and for full config loading end-to-end.
• .changeset/seven-pans-hunt.md: Patch changeset entry added.

Confidence Score: 5/5

Safe to merge — the change is a one-line fallback that only activates when HOME is absent, with no effect on existing Linux/macOS behaviour.

The fix is minimal and well-scoped: a single || operand in resolveUserConfigDir that is already exercised by two new tests covering both the raw path-resolution layer and the full config-loading pipeline. Existing tests are unaffected.

No files require special attention.

Important Files Changed

Filename	Overview
src/core/paths.ts	One-line fix: env.HOME
src/core/paths.test.ts	New test verifies both resolveGlobalConfigPath and resolveHunkStatePath produce correct paths when only USERPROFILE is present; uses the same cast pattern as existing env tests.
src/core/config.test.ts	New integration-style test confirms that resolveConfiguredCliInput picks up and applies a global config placed under USERPROFILE/.config/hunk/config.toml when HOME is absent.
.changeset/seven-pans-hunt.md	Patch changeset entry for the Windows config fix; correctly scoped to the hunkdiff package.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[resolveUserConfigDir] --> B{XDG_CONFIG_HOME set?}
    B -- Yes --> C[return XDG_CONFIG_HOME]
    B -- No --> D{HOME set?}
    D -- Yes --> E[return HOME + /.config]
    D -- No --> F{USERPROFILE set?}
    F -- Yes --> G[return USERPROFILE + /.config]
    F -- No --> H[return undefined]

    C --> I[resolveGlobalConfigPath + /hunk/config.toml]
    E --> I
    G --> I
    C --> J[resolveHunkStatePath + /hunk/state.json]
    E --> J
    G --> J

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flowchart TD
    A[resolveUserConfigDir] --> B{XDG_CONFIG_HOME set?}
    B -- Yes --> C[return XDG_CONFIG_HOME]
    B -- No --> D{HOME set?}
    D -- Yes --> E[return HOME + /.config]
    D -- No --> F{USERPROFILE set?}
    F -- Yes --> G[return USERPROFILE + /.config]
    F -- No --> H[return undefined]

    C --> I[resolveGlobalConfigPath + /hunk/config.toml]
    E --> I
    G --> I
    C --> J[resolveHunkStatePath + /hunk/state.json]
    E --> J
    G --> J

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