Display improvements; migrate tests to Vitest

[patik]

• Fixes Fix grammar #8
• Migrates tests to vitest
• Add a loading spinner for each command
• Just one line of output for each branch deletion attempt

CleanShot.2025-06-01.at.19.22.01.mp4

[Copilot]

Pull Request Overview

This pull request enhances the branch deletion UX by adding per-branch loading spinners, streamlining the final output messages, and updating tests and retry logic to match the new messaging.

• Introduces an ora spinner for each deleted branch and updates summary messages
• Adjusts test scripts to align with the new output format
• Refines retry logic messages and adds a top-level success message in the main program

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/utils/find-stale.ts	Replaced gray console logs with an ora spinner and updated summary messages
src/tests/manual.ts	Added a manual test helper script
src/tests/index.ts	Updated import paths and assertions to reflect new output text
src/program/retryFailedDeletions.ts	Tweaked the retry message formatting and getCountsText logic
src/program/index.ts	Added a success message when no deletions fail
package.json	Added ora dependency and updated test/lint script commands

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (1)

src/tests/manual.ts:3

• [nitpick] This manual test script lacks any assertions or validation, so it won't catch regressions. Consider converting it into an automated test with assertions or documenting its expected output.

function run() {