fix(ci): build gittensory-engine before ui:build's miner-ui step

[JSONbored]

Summary

• PR feat(miner-extension): add workspace package and CI wiring #5567 added npm --workspace @jsonbored/gittensory-miner-ui run build to the ui:build script chain, but gittensory-miner-ui's vite config transitively dynamic-imports @jsonbored/gittensory-miner's portfolio-dashboard.js (via vite-portfolio-queue-api.ts), which depends on @jsonbored/gittensory-engine.
• ui:build never builds the engine first, so its dist/ doesn't exist and vite's config bundler fails: Failed to resolve entry for package "@jsonbored/gittensory-engine".
• This worked by accident inside npm run test:ci (an earlier step, build:miner, happens to build the engine first in that chain) but fails standalone wherever ui:build runs in isolation — confirmed via ui-preview.yml's "Build UI preview artifact" job failing identically on this branch and on an unrelated renovate/npm-minor-patch branch at the same time, meaning it's been broken on main for every PR touching apps/gittensory-ui/** or packages/** since feat(miner-extension): add workspace package and CI wiring #5567 merged.
• ui:lint/ui:typecheck are unaffected: TS/ESLint resolve @jsonbored/gittensory-engine via tsconfig path-mapping to source, not the compiled package entry — confirmed both pass with the engine's dist/ absent.

Test plan

• Reproduced the failure locally with a fresh worktree + npm ci (no engine dist/), confirmed the fix resolves it.
• Full local gate (npm run test:ci + npm audit --audit-level=moderate) green.

[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 94.99%. Comparing base (1cf4c0e) to head (c1a9947).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5586   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files         573      573           
  Lines       45490    45490           
  Branches    14680    14680           
=======================================
  Hits        43212    43212           
  Misses       1527     1527           
  Partials      751      751           

Flag	Coverage Δ
shard-1	44.03% <ø> (ø)
shard-2	35.66% <ø> (ø)
shard-3	32.16% <ø> (ø)
shard-4	32.86% <ø> (ø)
shard-5	31.86% <ø> (ø)
shard-6	44.17% <ø> (ø)

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