fix: tags suggestions are not loading

[sapayth]

closes #823

Summary

Fixes the Tags field on frontend forms where the autocomplete suggestion dropdown stopped working — every keystroke returned a "Permission denied" error instead of matching tags. With this fix, users can again type into a Tags field and see live suggestions as expected.

Summary by CodeRabbit

Release Notes

• Bug Fixes
  • Improved data serialization in the tag autocomplete feature to ensure consistent and reliable query handling.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: eeb9cbd2-63f2-4c81-8a76-879de4b21b30

📥 Commits

Reviewing files that changed from the base of the PR and between 3252a39 and b826653.

📒 Files selected for processing (1)

• includes/Fields/Form_Field_Post_Tags.php

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Walkthrough

Updates the JavaScript initialization for tag autocomplete functionality to use wp_json_encode() for query string serialization instead of esc_js() within quoted JS string literals.

Changes

Cohort / File(s)	Summary
Tag Field JS Encoding includes/Fields/Form_Field_Post_Tags.php	Modified query string serialization approach for tag suggestion feature initialization, switching from inline escaping to JSON encoding.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

A single line hops into place,
JSON encoding wins the race,
Tag suggestions now more sound,
Better escaping all around! 🐰✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR aims to fix tag suggestions, but linked issue #823 is about Email Address field mapping in the Edit Profile form—a completely different feature with no relationship to the tag autocomplete functionality.	Verify that the PR is linked to the correct issue. If this PR fixes tag suggestions (#1851), it should reference the appropriate tags-related issue, not issue #823 about email field mapping.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title 'fix: tags suggestions are not loading' accurately describes the main change, which fixes a JavaScript serialization issue in the tag autocomplete feature.
Out of Scope Changes check	✅ Passed	The code changes are narrowly scoped to fixing JavaScript serialization in tag suggestions (wpuf_frontend.ajaxurl + query_string handling), which aligns with the PR's stated objective of restoring tag autocomplete functionality.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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