fix[faustwp]: (#1872) use home_url() in handle_generate_endpoint

[latenighthackathon]

Summary

On Bedrock-style installs where WordPress core lives under /wp/, site_url('/generate') returns https://example.com/wp/generate but $_SERVER['REQUEST_URI'] is still /generate. The preg_match in handle_generate_endpoint() never fires and the auth-code redirect silently breaks.

home_url() returns the public-facing URL (what REQUEST_URI actually contains), which matches on both standard and Bedrock installs.

Related Issue

Closes #1872

Refiled per @josephfusco's guidance on #2315 — a new filter is not needed, just the correct URL helper.

Confirm the issue

# On canary, the endpoint uses site_url() which includes /wp/ on Bedrock:
grep -n "site_url.*/generate" plugins/faustwp/includes/auth/callbacks.php
# Expected (before fix):
#   25: $search_pattern = ':^' . site_url( '/generate', 'relative' ) . ':';

Confirm the fix

# After this PR, home_url() matches the public-facing URL that REQUEST_URI carries:
grep -n "home_url.*/generate\|site_url.*/generate" plugins/faustwp/includes/auth/callbacks.php
# Expected:
#   25: $search_pattern = ':^' . home_url( '/generate', 'relative' ) . ':';

Run the test suite

# PHPCS for the touched file
npm run phpcs --prefix plugins/faustwp -- includes/auth/callbacks.php

# PHPUnit for the auth module
npm run test:php --prefix plugins/faustwp -- --filter=Auth

Checklist

• Targets canary
• Changeset added (@faustwp/wordpress-plugin patch)
• Commit is signed (SSH)
• Semantic commit prefix with issue reference

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🦋 Changeset detected

Latest commit: c9b579f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@faustwp/wordpress-plugin	Patch

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