fix(loops): Remove empty state CTA buttons

[charlesvien]

Problem

The loops empty state has a "Learn more" button pointing at https://posthog.com/docs/loops, which does not exist, and a "Create a loop" button that duplicates the create entry points already on the page.

Changes

Removed both buttons from LoopsEmptyState so the card is just the illustration, heading and getting-started steps. Dropped the now unused onCreate and disabledReason props from the component and its call sites in LoopsListView and WebsiteChannelLoops.

How did you test this?

Updated the LoopsEmptyState unit tests and ran them, plus Biome and turbo typecheck --filter=@posthog/ui.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

[trunk-io]

😎 This pull request was merged.

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit c2bff20.}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "remove loops empty state CTA buttons" | Re-trigger Greptile}

[github-actions]

Straightforward, well-contained removal of dead/broken CTA buttons from an empty-state component, with props cleaned up consistently across all call sites and tests updated to match; no risky territory touched and no outstanding concerns.

• Author wrote 13% of the modified lines and has 15 merged PRs in these paths (familiarity MODERATE).
• 👍 on the PR from greptile-apps[bot].

Gate mechanics and policy version

Gate		Result
prerequisites	✓	all clear
deny-list	✓	no deny categories matched
size	✓	59L, 3F substantive, 104L/4F incl. docs/generated/snapshots — within ceiling
tier	✓	T1-agent / T1c-medium (104L, 4F, single-area, fix)
stamphog 2.0.0b3		.stamphog/policy.yml @ 113eae9 · reviewed head c2bff20