chore: fix the typo and frame the displayed text based on the usability test

[ylimezhang]

• correct the typo
• frame the wording

[Copilot]

Pull Request Overview

This PR addresses typos and adjusts the displayed text based on usability testing feedback. The changes primarily correct spelling differences (e.g., "visualizing" to "visualising") and rephrase messaging for improved clarity and consistency.

• Corrected typos in several text elements.
• Updated phrasing in user-facing messages.
• Adjusted tooltip behavior settings.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/prettyprint_assertions_and_pictures.test.ts	Corrected British English spelling for clarity in documentation.
app/tutorial/outcomes/page.mdx	Updated header text to reflect consistent spelling.
app/tutorial/introduction/page.md	Corrected heading and updated verification text per usability recommendations.
app/tutorial/components/data-content.ts	Updated navigation titles with consistent terminology.
app/tutorial/assertion/page.mdx	Adjusted header text for consistent presentation.
app/steps.tsx	Modified punctuation in displayed text to test readability.
app/dashboard/components/step-by-step-view/index.tsx	Revised messaging for elimination order descriptions.
app/dashboard/components/lazyload-view/index.tsx	Reworded instructions for exploring candidate outcomes.
app/dashboard/components/Information-icon-text.tsx	Revised tooltip configuration by removing onMouseLeave and adding a new prop for behavior.

Comments suppressed due to low confidence (2)

app/steps.tsx:152

• [nitpick] Consider revisiting the use of a hyphen instead of an em dash here to maintain consistency with similar user-facing text throughout the app.

          <Brown> reaching the top - no cuts, no doubts!</Brown>

app/dashboard/components/Information-icon-text.tsx:45

• Removing the onMouseLeave handler may affect the tooltip's hiding behavior; please verify that tooltips disappear as expected on mouse leave.

onMouseLeave={handleMouseLeave}