Add missing prettyblock_llm_links template and harden rendering to fix 500 error

[CySSoO]

Motivation

• The everblock_llm_links prettyblock referenced a missing template which caused runtime 500 errors when the block was rendered.

Description

• Added views/templates/hook/prettyblocks/prettyblock_llm_links.tpl to provide the expected template and avoid the missing-file error.
• The template renders the optional heading and iterates state entries with defensive checks so links are only output when both label and base_url are present.
• The prompt is built by replacing {{title}} and {{url}} in the prompt_template and the prompt portion is URL-encoded before concatenating with base_url to form the final link.
• Links opened in a new tab include rel="noopener noreferrer" and icon rendering is guarded to avoid template failures.

Testing

• Verified the new file was added and committed with git show --name-status --oneline HEAD -1 which lists the added template.
• Confirmed repository status with git status --short returned a clean working tree after the commit.
• Performed a Playwright smoke attempt to capture the UI which failed with ERR_EMPTY_RESPONSE because no local web server was reachable on http://localhost:80, :8080, or :3000.

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Codex Task