test: add missing noprefix test for hunk show command

[benvinegar]

Follow-up to #106 - adds the missing test coverage for `hunk show` with `diff.noprefix=true`.

This completes the test coverage for all git-backed commands that use `withNormalizedDiffPrefixes()`:

• ✓ `hunk diff` (unstaged) with noprefix
• ✓ `hunk diff --staged` with noprefix
• ✓ `hunk stash show` with noprefix
• ✓ `hunk diff` with mnemonicPrefix
• ✓ `hunk show` with noprefix (this PR)

All 5 tests pass:
````
bun test test/loaders.test.ts -t "diff.noprefix is enabled|diff.mnemonicPrefix is enabled"
5 pass, 15 filtered out, 0 fail
````

[greptile-apps]

Greptile Summary

This PR adds a single integration test that fills the last gap in the withNormalizedDiffPrefixes() test matrix: verifying that hunk show correctly parses diff output even when diff.noprefix=true is set in the local git config. The new test follows the same structure as the three existing noprefix/mnemonicPrefix tests and slots in cleanly between the existing show tests.

• New test "loads show output when diff.noprefix is enabled" creates a fresh temp repo, enables diff.noprefix locally, commits a change, then calls loadFromRepo with kind: "show" and asserts the parsed file path is correct.
• The test exercises buildGitShowArgs → withNormalizedDiffPrefixes, which injects -c diff.srcPrefix=a/ -c diff.dstPrefix=b/ to override any noprefix/mnemonicPrefix configuration before running git show.
• No production code changes; all changes are confined to the test file.

Confidence Score: 5/5

• This PR is safe to merge — it adds a single, self-contained test with no production code changes.
• The change is a test-only addition that follows established patterns exactly. The test setup, execution, and assertion are consistent with the other noprefix tests in the file, and it correctly exercises the intended code path (buildGitShowArgs + withNormalizedDiffPrefixes).
• No files require special attention.

Important Files Changed

Filename	Overview
test/loaders.test.ts	Adds a new integration test for hunk show with diff.noprefix=true, following established patterns. The test correctly configures a local git repo, sets diff.noprefix, commits a change, and asserts that loadFromRepo still resolves the file path — exercising withNormalizedDiffPrefixes in buildGitShowArgs.

Sequence Diagram

sequenceDiagram
    participant Test as Test (loaders.test.ts)
    participant Repo as Temp Git Repo
    participant Loader as loadFromRepo / loadAppBootstrap
    participant Git as git show

    Test->>Repo: git init + initial commit (alpha.ts v1)
    Test->>Repo: git config diff.noprefix true
    Test->>Repo: commit alpha.ts v2 (HEAD)
    Test->>Loader: loadFromRepo({ kind: "show" })
    Loader->>Loader: buildGitShowArgs() → withNormalizedDiffPrefixes()<br/>injects -c diff.srcPrefix=a/ -c diff.dstPrefix=b/
    Loader->>Git: git -c diff.srcPrefix=a/ -c diff.dstPrefix=b/ show HEAD
    Git-->>Loader: diff output (normalized prefixes)
    Loader-->>Test: bootstrap.changeset
    Test->>Test: assert files = ["alpha.ts"] ✓

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