Add LLM links Prettyblock banner

[CySSoO]

Motivation

• Provide a new Prettyblock that renders a banner of links to AI assistants so editors can offer one-click prompts for the current page.
• Links must include an interpolated prompt containing the page title and url so the assistant receives page context.
• The block should work with the existing Prettyblocks system and be compatible with Bootstrap 5 while remaining retro-compatible with Bootstrap 4 classes.

Description

• Added a new Smarty template views/templates/hook/prettyblocks/prettyblock_llm_links.tpl that renders an optional heading and a responsive grid of LLM link items using placeholders and safe escaping.
• Registered the new block in src/Service/EverblockPrettyBlocks.php (everblock_llm_links) with configuration fields and a repeater for each LLM entry including label, base_url, prompt_template, icon, icon_alt, and open_in_new_tab.
• Implemented client-side interpolation in views/js/everblock.js via initPrettyblockLlmLinks() to replace {{title}} and {{url}} in prompt templates and set the final href (encodeURIComponent applied).
• Added layout and visual rules in views/css/everblock.css to style the new block (.prettyblock-llm-links*) with grid/column padding and 92×92 icon sizing, and ensured links include rel="noopener noreferrer" when opened in a new tab.

Testing

• No automated tests were run for this change.

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Codex Task