fix: update @playwright/test to 1.59.1 and fix e2e tests

[Pixel998]

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What is the purpose of this pull request?

This PR updates @playwright/test to 1.59.1 and fixes the e2e tests that became unreliable after the upgrade.

The failing tests were using keyboard-driven select-all and delete behavior inside the CodeMirror editor. After the Playwright update, that interaction no longer behaved consistently across browsers, especially in WebKit, so the default sample code was not always fully replaced before assertions ran.

What changes did you make? (Give an overview)

• Updated @playwright/test to 1.59.1
• Added a shared helper for interacting with the CodeMirror editor in the e2e tests. The affected tests now replace editor contents using fill() instead of relying on Ctrl/Cmd+A followed by Backspace.

Related Issues

#380

Is there anything you'd like reviewers to focus on?

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[Copilot]

Pull request overview

This PR updates Playwright to @playwright/test@1.59.1 and refactors e2e tests to interact with the CodeMirror editor more reliably after the upgrade.

Changes:

• Bumped @playwright/test (and lockfile-resolved playwright / playwright-core) to 1.59.1.
• Added a shared CodeMirror editor helper for e2e tests.
• Updated affected e2e tests to replace editor contents via fill() rather than keyboard-driven select-all/delete.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Updates @playwright/test devDependency version to ^1.59.1.
package-lock.json	Aligns resolved Playwright packages (@playwright/test, playwright, playwright-core) to 1.59.1.
e2e-tests/helpers/code-editor.ts	Introduces shared helpers to locate and replace CodeMirror editor content in tests.
e2e-tests/persistence.test.ts	Uses the shared helper to reliably set/assert editor content during hash/localStorage persistence flows.
e2e-tests/code-editing-and-ast-interaction.test.ts	Uses the shared helper for deterministic editor updates during AST + ESQuery interactions.

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[Copilot]

getCodeEditor() currently selects the last textbox within the "Code Editor Panel" region. Since the panel already contains multiple textboxes (e.g. the ESQuery selector) and could gain more over time, this selector is brittle and may start pointing at the wrong element. Prefer selecting the editor by its accessible name (the CodeMirror component sets aria-label="Code Editor"), e.g. query the textbox with name "Code Editor" (optionally still scoped to the region).

Suggested change

	.getByRole("textbox")
	.last();
	.getByRole("textbox", { name: "Code Editor" });