feat: auto open diagnostics on error.

[knightedcodemonkey]

No description provided.

[Copilot]

Pull request overview

This PR improves the diagnostics UX by automatically opening the diagnostics drawer when a user-initiated lint/typecheck run finds issues, and updates UI styling/tests to match.

Changes:

• Adjust mobile positioning of the diagnostics drawer to sit closer to the viewport bottom.
• Add a userInitiated flag + onIssuesDetected callback to lint/type diagnostics controllers, and wire them in app.js to open the drawer on detected issues.
• Update Playwright tests to use helpers for drawer open/close and to assert the new auto-open behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/styles/diagnostics.css	Tweaks small-viewport drawer positioning (bottom: 12px).
src/modules/type-diagnostics.js	Adds onIssuesDetected + userInitiated plumbing and triggers callback when user-initiated type errors are found.
src/modules/lint-diagnostics.js	Adds onIssuesDetected + userInitiated plumbing and triggers callback when user-initiated lint issues are found.
src/app.js	Hooks onIssuesDetected to open the diagnostics drawer; marks button-driven runs as user-initiated.
playwright/app.spec.ts	Refactors drawer interactions into helpers and updates expectations for auto-open behavior.

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