Backtest result card and saved-run history now show an explicit dividend
badge per run: green 'ตามวันจริง' for dated_ledger (real ex-date x qty cash
flow), amber 'Proxy (ต่อหุ้น)'/'Proxy' for estimates, plus a footnote that
matches the actual dividend_method. Frontend build passes (bundle
index-DDItjwYy.js); served bundle contains the new strings.
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