fix(ui): show StatUnavailable when KPI source queries fail (#8818)

[kurosawareiji7007-hub]

Closes #8818

Supersedes closed #8933 (maintainer: Total stake showed Coins glyph + StatUnavailable together on desktop/tablet), #8926, #8905, #8901, #8899.

Desktop/tablet fix (vs #8933)

The compact masthead "Total stake" strip always rendered the decorative Coins icon beside the figure. On error that produced Coins + AlertCircle + "Unavailable". The Coins glyph now only renders on the ready branch with formatTao(...).

Summary

Four KPI surfaces rendered a confident 0 / "no positions" / "Unset" when their source useQuery failed. Wired each through statPhase + StatUnavailable.

StatUnavailable now uses h-[1em] so error tiles match the parent KPI value-line height (StatTile display metrics) instead of collapsing to text-sm beside numeric neighbours.

What changed

1. /subnets Total stake — statPhase(economicsRes)
2. /accounts/<ss58> Positions — portfolioPhase={statPhase(portfolioResult)} into AccountKpiBand
3. /subnets/<netuid>?tab=activity ActivityEventRollup — independent phases; dual failure still renders Unavailable tiles
4. /chain/governance Sudo key — error → StatUnavailable

Test plan

• Source-assertion suites for all four sites
• Forced-503 capture with wait for visible Unavailable (account/subnets/sudo/subnet rollup)
• Confirmed after account shot shows Positions → Unavailable (not portfolioResult is not defined)
• Full Desktop/Tablet/Mobile × Light/Dark before/after matrix (fixed viewport, mg-theme)
• CI green on this PR

Screenshots

Blocked: /api/v1/economics, .../portfolio, .../event-summary, .../axon-removals, /api/v1/sudo/key.

/subnets Total stake

Viewport · Theme	Before	After
Desktop · Light	before	after
Desktop · Dark	before	after
Tablet · Light	before	after
Tablet · Dark	before	after
Mobile · Light	before	after
Mobile · Dark	before	after

Account Positions KPI

Viewport · Theme	Before	After
Desktop · Light	before	after
Desktop · Dark	before	after
Tablet · Light	before	after
Tablet · Dark	before	after
Mobile · Light	before	after
Mobile · Dark	before	after

/subnets/1?tab=activity Activity rollup

Viewport · Theme	Before	After
Desktop · Light	before	after
Desktop · Dark	before	after
Tablet · Light	before	after
Tablet · Dark	before	after
Mobile · Light	before	after
Mobile · Dark	before	after

Governance Sudo key

Viewport · Theme	Before	After
Desktop · Light	before	after
Desktop · Dark	before	after
Tablet · Light	before	after
Tablet · Dark	before	after
Mobile · Light	before	after
Mobile · Dark	before	after

[loopover-orb]

Important

🟨🟨🟨🟨🟨🟨🟨🟨🟨🟨🟨🟨

⏳ LoopOver is waiting…

LoopOver has seen this pull request and is waiting on CI checks to finish before reviewing it. This comment will update once the review runs.

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

[superagent-security]

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.93%. Comparing base (46f6c56) to head (9cf2f51).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8935   +/-   ##
=======================================
  Coverage   97.93%   97.93%           
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  Files         450      450           
  Lines       31585    31585           
  Branches    11778    11778           
=======================================
  Hits        30934    30934           
  Misses        150      150           
  Partials      501      501           

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[JSONbored]

Does not look any different from the previous attempts. Closing.