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e03204bb96
Chart had no way to read the value at a specific date — users had to infer Saved amounts from line position relative to the y-axis labels added in the previous commit. - Transparent <rect> overlay covers the plot area + catches pointer. - pointermove uses d3.bisector to snap to the nearest saved series point, draws a dashed crosshair + a saved-line dot + a projection-line dot (linearly interpolated between today and target). - HTML tooltip lives inside the chart root (cleared on next _draw) showing "date / Saved: $X / Projected: $Y". Clamps to viewport so it doesn't overflow the card. - pointerleave hides everything. Pointer events unify mouse + touch — single handler covers both desktop hover and mobile tap-and-drag. No keyboard nav yet; tracked as follow-up (Stimulus controller is the right home but won't ship in this round).