[examples] Remove node expand/fold example and related code #492

[Sohaibkundi2]

The node expand/fold example was broken locally with 'Uncaught ReferenceError: module is not defined' and is no longer used in OpenWISP.

Removed:

• example_templates/netjsongraph-nodeExpand.html
• public/assets/data/netjsongraph-foldNodes.json
• related import and entry in test/browser.test.utils.js
• card link from index.html

Description of Changes

Removes the broken node expand/fold example as discussed in #492.
The example was failing locally with Uncaught ReferenceError: module is not defined.
This is a focused PR addressing only the nodeExpand removal item from the issue.

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Related to #492

Screenshot

Not applicable - this PR removes a broken example, no visual changes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8e01f50f-2fe1-40b6-8462-39b397963a24

📥 Commits

Reviewing files that changed from the base of the PR and between 4fe9913 and 52273ee.

📒 Files selected for processing (1)

• index.html

💤 Files with no reviewable changes (1)

• index.html

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📝 Walkthrough

Walkthrough

This pull request removes the "Nodes expand or fold" example and its assets: the example template public/example_templates/netjsongraph-nodeExpand.html, the backing data public/assets/data/netjsongraph-foldNodes.json, the example card link in index.html, and the corresponding mapping entry in test/browser.test.utils.js. No other application logic, exported APIs, or runtime code paths were modified.

Sequence Diagram(s)

(Skipped — change is removal of example files and does not introduce or alter multi-component control flow requiring a sequence diagram.)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• [chores] Improve examples (reordered, minor test improvements) #493 — Edits/removes the same netjsongraph-nodeExpand example and related files; directly related to this removal.
• [change] Reduce library size #392 #425 — Also removes the netjsongraph-nodeExpand demo and associated test/data files; strongly related.

Suggested reviewers

• nemesifier

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title uses '[examples]' instead of a required type prefix (fix, change, feature, qa, ci, chores, docs) and does not follow the specified format.	Update title to follow '[type] Descriptive title' format, e.g., '[chores] Remove node expand/fold example and related code #492' or '[fix] Remove broken node expand/fold example #492'.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description includes most required sections and checklist items are mostly completed, though the PR notes that new/updated tests were not written for code removal.
Bug Fixes	✅ Passed	PR removes broken example files outside npm distribution (dist/, src/). Not applicable to bug fix check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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