chore(miner-ui): remove 3 dead exports only reachable from tests (emptyPortfolioQueueSummary, emptyLedgersSummary, defaultGovernorPauseState)

[JSONbored]

Context

Three exported values in apps/loopover-miner-ui/src/lib/ have zero real (non-test) callers, confirmed via repo-wide search:

• emptyPortfolioQueueSummary — lib/portfolio-queue.ts:54
• emptyLedgersSummary — lib/ledgers.ts:21
• defaultGovernorPauseState — lib/governor.ts:24

tsconfig.json has "noUnusedLocals": false, so nothing in the build catches this.

Requirements

• Confirm via a fresh repo-wide search that all three have zero real (non-test) callers.
• Remove each, along with any test that exists purely to exercise the removed export (keep tests for the surrounding module's real behavior).
• If a genuine real use case exists for any of the three (e.g. a route's error/loading fallback state that should use one of these defaults but currently constructs its own inline default), wire it in instead of deleting — but only if a real current gap is found, not speculatively.

Deliverables

• All 3 confirmed-dead exports removed (or wired into a genuine real call site if one is found).

Expected Outcome

No orphaned default/empty-state constants remain with zero real usage in apps/loopover-miner-ui/src/lib.

Links & Resources

• apps/loopover-miner-ui/src/lib/portfolio-queue.ts:54, lib/ledgers.ts:21, lib/governor.ts:24

[linear-code]

JSO-4296