fix(test): preserve string-literal tabs in convertTabsToSpaces

[fengmk2]

Summary

• convertTabsToSpaces() in packages/test/build.ts did a blanket \t → 2-space rewrite over every dist .js file. Upstream @vitest/snapshot decides multi-line inline snapshot indentation with indent.includes("\t") where the "\t" is a literal tab byte in the bundled source. The blanket replace turned that into indent.includes(" "), so any 2+ space indent matched and the tab-appending branch always ran — producing tab-indented snapshots inside 2-space-indented test files.
• Restrict the replacement to leading tabs only via /^\t+/gm. Indentation is still normalized (downstream patches that rely on space indent keep working), but tabs inside string and template literals are now preserved.

Root cause (byte-level)

Upstream @vitest/snapshot/dist/index.js:369:

\t const indentNext = indent.includes("<TAB>") ? `${indent}\t` : `${indent}  `;

The <TAB> inside the includes(...) string is a real 0x09 byte. The \t in the template literal is the 2-char escape sequence (\ + t).

Before the fix, convertTabsToSpaces rewrote both the leading tab AND the literal tab byte inside the string to two spaces. The escape sequence was untouched. Result at runtime:

• indent.includes(" ") is true for any 2+ space indent
• Snapshot lines get appended with ${indent}\t → a real tab byte

After the fix only leading tabs are rewritten; the string-literal tab survives.

Test plan

• Unit regression test in packages/test/__tests__/build-artifacts.spec.ts asserts the bundled snapshot file preserves indent.includes("\t") with a literal tab byte (passes after fix, fails before).
• Snap test in packages/cli/snap-tests/test-inline-snapshot-indent/ reproduces the issue's exact reproduction steps (vp test run -u on a 2-space-indented file) and captures the rewritten file content. Verified that reverting the fix produces a snap.txt containing real tabs (<4 spaces><TAB>"alpha) while the fixed build produces 6-space indentation.
• All 6 packages/test unit tests pass.
• vp check --fix is clean.

Closes #1553

---

Note

Medium Risk
Touches the test package build post-processing (convertTabsToSpaces) which rewrites generated dist artifacts; a regex mistake could subtly change bundled code semantics beyond formatting, but the change is narrowly scoped and covered by new regression tests.

Overview
Fixes a dist-build formatting step so it only converts leading tab indentation to spaces, instead of rewriting all tab bytes and accidentally altering string/template literal contents.

Adds regression coverage for inline snapshot indentation: a new build-artifact assertion ensures @vitest/snapshot still contains indent.includes("\t"), and a new CLI snap-test reproduces vp test run -u updating an inline snapshot in a 2-space-indented file to verify the written snapshot stays space-indented (not tab-indented).

^{Reviewed by Cursor Bugbot for commit 4eb4ed1. Configure here.}

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[fengmk2]

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^{Reviewed by Cursor Bugbot for commit 4eb4ed1. Configure here.}