feat: control chat visibility from the dashboard

[HardeepAsrani]

Description

Adds visibility rules for the chat, replacing the single Enable/Disable toggle on the dashboard.

Under Hyve → Dashboard → "Where should Hyve appear?" the admin can pick:

• Show on all pages
• Show only on selected content — the chat appears only on the URLs listed below
• Show everywhere except selected content — the chat is hidden on the URLs listed below
• Don't show automatically — the chat is only placed via the block or shortcode

For the two "selected content" modes, content is matched by URL path with a contains (whole section, e.g. /shop/) or matches (one exact URL) operator. Blocks and shortcodes continue to work for manual placement in every mode.

The old chat_enabled toggle is migrated to the new display_mode setting automatically (enabled → all pages, disabled → don't show automatically), so existing sites keep their current behavior.

Closes: https://github.com/Codeinwp/hyve/issues/189

Screenshot

QA

1. On a site upgrading from a previous version:
   • A site that had chat enabled should now show "Show on all pages" selected, and the chat still appears everywhere.
   • A site that had chat disabled should show "Don't show automatically" selected, and the chat does not auto-appear.
2. Show on all pages → chat appears on the front page, posts, and pages.
3. Show only on selected content:
   • Add a rule / with operator matches → chat appears only on the homepage.
   • Add a rule /shop/ with operator contains → chat appears on every URL under /shop/ (e.g. a product), and nowhere else.
   • Click Save visibility and confirm "Saved." appears, then reload and confirm the rules persisted.
4. Show everywhere except selected content:
   • Add a rule for a page's path → chat appears everywhere except that page.
5. Don't show automatically → chat does not appear anywhere on its own.
6. In every mode, the Hyve block and [hyve] shortcode still render the chat where placed.
7. The empty-knowledge-base notice and Overview stats on the dashboard still render as before.

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