Add contextual guidance to canvas Help and dynamic resource link

[mniinio]

Motivation

• Improve context handling by showing method-specific guidance when a canvas is selected so users get immediate, localized purpose and usage tips.
• Make the top-brand link and help actions point to the currently selected canvas method page instead of always linking to a single resource.

Description

• Replace the static brand link and expose the brand element as this.brandLink, and compute a resourceSlug from contentData.templateId to point the brand to https://www.apiopscycles.com/resources/<slug>/ and set an aria-label accordingly.
• Add updateContextualContent() which reads localizedData for the current contentData and prepends a .cc-help__context section to the Help panel containing the localized title, purpose, and howToUse, plus a method page link; call it from render() and renderHelp().
• Add CSS rules for .cc-help__context in styles/canvascreator.css to visually separate the contextual help block.
• Add a focused UI test in tests/initCanvasCreator.test.js that verifies the Help context content and the brand link update when switching canvases/locales.
• Document the user-facing change under an Unreleased section in CHANGELOG.md.

Testing

• Ran the focused unit test with npx jest tests/initCanvasCreator.test.js --runInBand, and it passed.
• Ran the full test suite with npm test -- --runInBand, and all test suites passed (14 suites, 52 tests).
• Built and validated artifacts with npm run build and npm run minify-css, and both succeeded.

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Codex Task

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