Test/format utils portfolio route coverage

[Almikefred]

Summary

Adds test coverage for three pure lib/format.ts utility functions — parseTokenAmount's accept/reject boundaries, formatRawPlain's exact round-trip behavior against parseTokenAmount (including
trailing-zero handling), and compactNumber's K/M/B threshold behavior with explicit confirmation of the sub-1,000,000 non-compaction rule — plus route-level coverage for /portfolio's connect-prompt
and holdings-list states.

Changes

#250 — test: add coverage for parseTokenAmount

• All three accepted and five rejected input cases covered, plus excess-decimal-places rejection, matched against the real implementation.

#251 — test: add coverage for formatRawPlain

• Round-trip tests through parseTokenAmount confirmed exact for representative values, with explicit trailing-zero handling tested per the real implementation's actual normalization behavior.

#252 — test: add coverage for compactNumber

• K/M/B threshold boundary tests with decimal rounding behavior, and 1,000,000 non-compaction rule confirmed against real behavior.

#249 — test: add route-level coverage for /portfolio

• Disconnected → connect prompt; connected → holdings list, using existing test mocking patterns.

Notes

• Test-only delivery: no install/build/test/scripts run during implementation — every assertion was hand-verified by reading the real function/component implementations.
• Committer: Almikefred.
• No shared lib/contracts.ts mock helper from prior route-coverage work was found in this repo; existing test mocking patterns in components were reused for portfolio page tests.

Closes #250, Closes #251, Closes #252, Closes #249

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