NMS-20152: Forecasting and descriptive legend states on Resource Graphs

[joseanesONMS]

Reintroduce forecasting on the new Resource Graphs page and replace the useless "NaN" legend stats with descriptive states.

The Horizon 36 forecasting ran server-side measurement filters that require R; this reimplements it entirely client-side so it works on any install.

• Legend: a stat of exactly 0 printed "NaN" (d3 formatPrefix can't derive an SI prefix for 0) — now renders 0.00.
• Legend: genuinely non-finite stats render No Data (source column had no samples) or Invalid Data (samples present, result non-finite) instead of "NaN".
• Adds a Forecasting action on each multi-graph that opens a client-side Holt-Winters forecast (additive HW + polynomial trend, outlier removal, confidence bounds) — no R dependency.
• 1-day / 7-day / 31-day templates plus a Custom panel with per-field validation (confidence and outlier thresholds bounded, season × 2 < training window, integers ≥ 1).
• Confidence band is constant over the fitted region and widens as √h across the forecast horizon, so projections further out read as less certain.
• Warns when a large gap is bridged by interpolation, so a fabricated fit isn't presented as confident data.
• Covered by resourceForecasting.test.ts (engine math) and extended resourceGraphs.test.ts (legend states); full ui suite green.