feat: add projection segment on current-period bar in charts#886
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For the 'today', 'this week', and 'this month' bars, adds a semi-transparent stacked segment showing the projected remaining tokens/cost for the period, calculated as: extra = actual / fractionElapsed - actual where fractionElapsed uses minute-level precision: - day: (hours*60 + minutes) / 1440 - week: (isoWeekDay + dayFrac) / 7 (Mon=0...Sun=6) - month: (dayOfMonth - 1 + dayFrac) / daysInMonth Applies to all chart views (total, cost, model, editor, repository). Hidden in rolling-average mode. Uses same colour family as the actual bar but at 20-25% opacity so projection is visually distinct. Projection helpers are extracted to projectionUtils.ts with full unit-test coverage (18 tests). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
Adds a semi-transparent stacked "projected remaining" segment on top of the current-period bar in every chart view (today / this week / this month).
How it works
The projection formula matches the user spec:
where
fractionElapseduses minute-level precision:(hours×60 + minutes) / 1440(isoWeekDay + dayFrac) / 7(Mon=0…Sun=6)(dayOfMonth − 1 + dayFrac) / daysInMonthVisual style
rgba(54,162,235,0.6)rgba(54,162,235,0.2)rgba(34,197,94,0.6)rgba(34,197,94,0.2)rgba(200,200,200,0.25)Tooltip shows
📈 Projected (today)/📈 Projected (this week)/📈 Projected (this month).Not shown when
Files changed
src/webview/chart/projectionUtils.ts— new:getCurrentPeriodFraction()andcomputeProjectionExtra()helperssrc/webview/chart/main.ts— adds projection dataset to all 5 chart views; enables stacking on total/cost viewstest/unit/webview-chart-projection.test.ts— 18 unit tests, all passing ✅