fix: keep terminal prompts on fresh lines

[kbuffardi]

Summary

• track terminal line state across existing output paths so restored prompts cannot concatenate with visible output
• make Clear/Ctrl+K discard typed input and redraw one prompt at the cleared screen top-left; preserve typed input for Ctrl+L
• bump the extension patch version from 0.4.6 to 0.4.7

Validation

• npm run lint
• npm run test:e2e
• npm run build
• npm run version:check

Closes #78

[Copilot]

🟢 Approval recommended

The changes are localized, match the linked issue’s acceptance criteria, and include targeted E2E coverage for the new prompt/newline behavior.

Pull request overview

This PR improves the terminal UI layer by making prompt redraws newline-aware, ensuring prompts never concatenate with existing visible output, and aligns clear-screen behaviors across UI/keyboard paths. It also bumps the extension version to reflect the fix release.

Changes:

• Track whether the current terminal line already has visible content and prepend CRLF before writing a new prompt when needed.
• Unify clear-screen behavior via clearScreen(), making Clear/Ctrl+K discard typed input and Ctrl+L preserve it while redrawing the prompt cleanly.
• Add E2E coverage for prompt newline restoration and clear behavior; bump version from 0.4.6 to 0.4.7.

File summaries

File	Description
src/ui/terminal.js	Adds newline-aware prompt rendering and consolidated clear-screen logic with line-state tracking.
scripts/e2e-terminal-stop.test.mjs	Adds E2E assertions for clear behavior and prompt restoration after newline-less output.
package.json	Bumps extension/package version to 0.4.7.
package-lock.json	Updates lockfile version fields to 0.4.7.
manifest.json	Updates extension manifest version to 0.4.7.

Review details

• Files reviewed: 4/5 changed files
• Comments generated: 0
• Review effort level: Lite

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