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* feat(accounts): add Gains / ROI chart view for investment accounts Adds a fourth chart view to the account details page showing the historical unrealized gains series (market value - cost basis per holding, summed daily with LOCF and FX conversion), following the same ChartSeriesBuilder/Series pipeline as the existing views. Holdings without a usable cost basis (nil, or unlocked zero from providers) contribute zero gain, matching Holding#avg_cost semantics. * fix(accounts): carry cost basis forward over gap-filled holdings in gains series Gap-filled holding rows (weekends, price-history gaps) are persisted without cost_basis even though the position and basis are unchanged, which zeroed the gains series on those dates. Look up the basis from the latest snapshot that has a usable one instead of reading it from the current row, so already-persisted gap-filled rows are handled too. * docs(accounts): add method docstrings for gains chart view code Satisfies the pre-merge docstring coverage check on methods added or touched by the Gains / ROI feature. * fix(accounts): sign converted amount like main indicator in gains view Extracts the gains sign-prefix logic into a shared signed_format helper so the family-currency converted amount shown on foreign-currency accounts matches the main indicator (+€79.53 / +$85.00), and adds component tests covering the positive, negative, non-gains and foreign-currency formatting paths. * test(accounts): cover FX conversion path in gains series The gains_series tests only used USD holdings against a USD target, leaving the exchange_rates LATERAL join untested. Adds a case with EUR holdings converted to USD, including LOCF rate carry-forward. --------- Co-authored-by: Antoine GUYON <agy@ibanfirst.com>