web: add the B&W HIGH CONTRAST film sim to the PRESETS rail

The chip lands after ACRIPES and is a mono stock of its own, so it gets its own
baseFilter ('mono-high-contrast') rather than borrowing Acros': the PHOTO STYLE
chips are keyed by baseFilter, and the two greys must sit side by side.

The look is the B&W MIX plus a push at both ends. The mix rides the matrix — a
non-BT.709 row set (0.38/0.56/0.06, identical rows, sum 1.00) so a red roof
reads bright, a blue sky deep, and the separation is contrast before any curve.
The push rides FILM_TONE (shadow -0.32, highlight +0.26) so the ends move
without touching the midtones, and the midtone slope is SIM_CONTRAST_BIAS (4
contrast units) next to the sim's own exposure bias. The knobs stay at neutral:
a sim is colour and tone only.

Both B&W stocks being mono is now asked once, through isMonochromeBase, so the
colour-only stages (saturation, white balance, R/B fine-tune, chrome, hue
mixer) and the MONO strip label can never half-apply to one of them.

docker/frontend/shared/utils/defaultRecipes.ts

@@ -52,6 +52,7 @@ export const DEFAULT_ADJUSTMENTS: ColorAdjustments = {
 //   ASTIPES                Astia / Soft
 //   ETERNIPES              Eterna (cinema)
 //   ACRIPES                Acros (monochrome)
+//   B&W HIGH CONTRAST      Acros through a filter, ends pushed hard
 //   LC STREETLIFE CLASSIC  Leica Authentic Classic
 //   LC STREETLIFE VIVID    Leica Vivid
 export interface FilmSim {
@@ -70,6 +71,7 @@ export const FILM_SIMS: FilmSim[] = [
   { id: 'sim-astia', name: 'ASTIPES', baseFilter: 'astia', adjustments: { ...DEFAULT_ADJUSTMENTS } },
   { id: 'sim-eterna', name: 'ETERNIPES', baseFilter: 'eterna', adjustments: { ...DEFAULT_ADJUSTMENTS } },
   { id: 'sim-acros', name: 'ACRIPES', baseFilter: 'monochrome', adjustments: { ...DEFAULT_ADJUSTMENTS } },
+  { id: 'sim-bw-high-contrast', name: 'B&W HIGH CONTRAST', baseFilter: 'mono-high-contrast', adjustments: { ...DEFAULT_ADJUSTMENTS } },
   // The rangefinder digital look (M/Q/SL) is not a film stock, so it ships as its own
   // pair instead of one look that has to compromise. Both are still colour and
   // tone only: CLASSIC is Leica Authentic (the matrix carries the channel