fix(ui): shared StateBoundary on public repo-quality page

[RealDiligent]

Summary

• Replace hand-rolled loading/error <p> branches with StateBoundary + content-shaped skeleton (3 cards + trend table).
• Wire onRetry to useQuery refetch; HTTP failures throw so isError gets role="alert"; successful null payload uses EmptyState.

Closes #6821

UI Evidence

Before	After

Test plan

• Loading shows skeleton, not plain loading text
• Error has role=alert + Try again refetches
• Null/opt-out uses empty copy without alert
• Success asserts tolerate duplicate Merge ratio labels

Supersedes closed #6944 / #6946.

Made with Cursor

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[loopover-orb]

Warning

⏸️ LoopOver review result - manual review recommended

_{Review updated: 2026-07-17 14:56:08 UTC}

2 files · no blockers · CI green · clean

⏸️ Suggested Action - Manual Review

• AI review already in progress for this PR head: Another LoopOver pass is already running the AI review for this exact PR head. This pass is skipping to avoid a duplicate LLM call.

Review summary
AI review is already running for this PR head in another LoopOver pass. LoopOver is holding this PR for manual review until that pass completes.

Nits — 1 non-blocking

• AI review already in progress for this PR head — The gate is held for a human reviewer rather than passed automatically; it re-evaluates once the in-flight review completes or on the next update.

Decision drivers

• ✅ Code review — No blockers (No AI review summary)
• ⚠️ Gate result — Not blocking (Advisory; not blocking this PR.)

Context & advisory signals — never blocks the verdict

Signal	Result	Evidence
Linked issue	✅ Linked	#6821, #6944
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (2 linked issues).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 389 registered-repo PR(s), 194 merged, 33 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	RealDiligent; Gittensor profile; 389 PR(s), 33 issue(s).
Improvement	✅ Minor	risk: clean · value: minor

Linked issue satisfaction

Addressed
The diff replaces the hand-rolled loading/error <p> branches with StateBoundary and adds a content-shaped skeleton matching the 3-stat-card + trend-table layout, plus wires onRetry to useQuery's refetch as required. Tests verify role=alert with working retry, absence of the old plain loading text, and the skeleton rendering, directly reproducing the described gap.

Review context

• Author: RealDiligent
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: not available
• Official Gittensor activity: 389 PR(s), 33 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Keep the PR focused and include validation evidence before maintainer review.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

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Visual preview

Route	Viewport	Before (production)	After (this PR's preview)	Diff
/	desktop	before /	after /	—
/	mobile	before / (mobile)	after / (mobile)	—

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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LoopOver approves — the gate is satisfied and CI is green.