test: add unit tests — 70.3% coverage
Extracted storeIface from Handler so store can be mocked in tests.
Added handler_test.go with 98 test cases covering:
- All HTTP handlers (Dashboard, Transactions, Accounts, Categories, Goals,
Portfolio, Reports, Projections, NetWorth, Simulator, Sharing, Import*)
- Auth middleware (authMW, ownerOrViewerMW)
- Pure helpers (monthsBetween, parseFloat, sortStrings, appendIfMissing)
- Error paths (bad JSON, missing fields, store errors, bad CSV)
- Alert logic (budget exceeded, goal miss, spend pace)
- Template funcmap exercised via rich render scenarios
Also added tickerStore.resolve tests to portfolio_test.go.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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