feat(SectionCampaign): add title-selector attribute for customizable title injection

[Copilot]

Context

Adds a title-selector attribute to SectionCampaign component to enable customizable title injection. When provided, the component will inject the campaign title into the element matching the specified CSS selector. Title injection only occurs when the attribute is explicitly provided.

Related Jira ticket

N/A

Screenshots

N/A

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Changes:

• Added optional titleSelector property to SectionCampaign component
• Title injection only occurs when title-selector attribute is explicitly provided
• Updated JSDoc with attribute name mapping (title-selector)
• Added comprehensive test coverage for custom selector usage and default behavior (no injection)

Usage:

<!-- No title injection (default behavior) -->
<nosto-section-campaign placement="hero" section="featured"></nosto-section-campaign>

<!-- Title injection with custom selector -->
<nosto-section-campaign 
  placement="hero" 
  section="featured" 
  title-selector=".my-custom-title">
</nosto-section-campaign>

Note: Title injection is opt-in and only occurs when the title-selector attribute is provided. The titleSelector property expects a valid CSS selector; invalid selectors will throw a DOMException as per standard DOM behavior.

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[Copilot]

Pull request overview

Adds a title-selector attribute to nosto-section-campaign so consumers can control which heading element receives the injected campaign title, while keeping the existing .nosto-title default behavior.

Changes:

• Introduced optional titleSelector (title-selector) attribute/property on SectionCampaign.
• Updated title injection to use this.titleSelector || ".nosto-title" for backward-compatible behavior.
• Added tests for custom selector usage and default selector fallback.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/components/SectionCampaign/SectionCampaign.ts	Adds titleSelector support and uses it to locate the heading element for title injection.
test/components/SectionCampaign/SectionCampaign.spec.tsx	Adds coverage for custom title-selector and verifies default .nosto-title behavior remains intact.

[timowestnosto]

@copilot drop second sentence

[Copilot]

Removed the second sentence from the JSDoc. (157041d)

[nosto-release-public]

🎉 This PR is included in version 11.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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