refactor(progressSteps): improve progress steps implementation

[github-actions]

Closes #632

Applied changes based on Issue #632.

Implemented progressSteps improvements in runAction.ts with two concrete fixes:

1. Made steps mode-specific via getProgressSteps(createIssues):

• createIssues flow: Gather context -> Generate feature plan -> Create issues -> Wrap up
• normal edit flow: Gather context -> Apply edits -> Review changes -> Wrap up

2. Fixed progress completion timing:

• In createIssues mode, steps 3 and 4 are now marked complete after issue creation (runAction.ts).
• In normal mode, Wrap up is now marked only after handleResult completes (runAction.ts).

Validation:

• npm run build passes.
• npm run lint and npm test fail due many pre-existing repo-wide issues unrelated to this change.

[YiweiShen]

The issue is created only for testing purposes. The commit messages are correct, and the ticket will be closed.