fix(loops): Reintroduce main loops UI in the spaces view

[charlesvien]

Problem

The space-scoped Loops tab lost the templates, the ownership tabs and the wider layout from the main Loops page. Loops without a space attachment were missing from #me entirely.

Changes

Reintroduces the main Loops page pieces into the spaces view: the template grid (seeding the wizard with the space attached), the My loops / Team loops tabs in #me and the matching header copy and width.

How did you test this?

Verified #me and a team space in the running app over CDP. Typecheck, biome and the full @posthog/ui vitest suite pass.

Automatic notifications

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

[trunk-io]

😎 Merged manually by @charlesvien - details.

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 723a8fa.}

[charlesvien]

/trunk merge

[greptile-apps]

Prompt To Fix All With AI

### Issue 1
packages/ui/src/features/canvas/components/WebsiteChannelLoops.tsx:66-68
**Current-user errors break ownership tabs**

When the loops request succeeds but the current-user request fails, this view converts the missing user to a null owner ID, causing team-visible loops created by the current user to appear under Team loops instead of My loops. Handle the current-user error as the main Loops view does rather than rendering an incorrect ownership split.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "show ownership tabs on personal space lo..." | Re-trigger Greptile}

[stamphog]

---

[charlesvien]

/trunk remove

[charlesvien]

/trunk unmerge

[charlesvien]

/trunk cancel

[github-actions]

Frontend-only UI reintroduction (Loops tabs/templates in the spaces view) with no touch on risky territory; the sole reviewer concern (current-user fetch failure mishandling ownership split) is addressed in the diff via the added currentUserError branch and is marked resolved.

• Author wrote 30% of the modified lines and has 16 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	✓	104L, 3F substantive — within ceiling
tier	✓	T1-agent / T1c-medium (104L, 3F, single-area, fix)
stamphog 2.0.0b3		.stamphog/policy.yml @ 5f7dbf3 · reviewed head 245d455

New commits pushed (delta classified label_absent) — stamphog approval dismissed; re-review running automatically.

[github-actions]

Contained frontend-only change reusing existing loop-template components in the spaces view; the only substantive review concern (ownership-tab handling) targeted code from an earlier commit that is no longer part of the current diff, so it doesn't apply here.

• Author wrote 62% of the modified lines and has 16 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	✓	38L, 2F substantive — within ceiling
tier	✓	T1-agent / T1b-small (38L, 2F, single-area, fix)
stamphog 2.0.0b3		.stamphog/policy.yml @ 3d18b42 · reviewed head 723a8fa