Studio: fold WB and FX into LIGHT, and put every develop slider on -100..+100

WB and FX were separate tabs whose only content was the same Lightroom-style
develop column LIGHT already renders, so the rail carried three doors into one
room. LIGHT now owns the whole column: white balance, tone, presence, the
effects group (grain, dehaze, vignette) and the filters, in that order. The
`wb` and `fx` TabIds, their rail entries, their `wbLabel()` helper and the now
dead `tab.wb` / `tab.fx` i18n keys are gone; `ToolRail` documents eight tabs.

Every continuous develop value that the UI exposes as a symmetric knob now
runs -100..+100 instead of -10..+10. `paramDefs` gains the `HUNDRED` key set
and the `deepen` helper, which widens a def's range and scales its accessors by
ten, so the store keeps its -10..+10 internal scale and every stored look,
DEFAULT_RECIPES entry and URL round-trip is byte-identical. Params with a
meaningful physical scale (temperature in kelvin, exposure in EV-ish units,
grain, grain size, hdf, vignette, rotate, crop) keep their own units.

Highlight recovery no longer bends hue. The old knee clamped the per-channel
gain into 0.55..1.35, which is a per-channel operation and therefore a hue
rotation: on the flat skin patch it walked hue from 24 deg to 48 deg at
HIGHLIGHT +100, and on a saturated 30:1 chroma ramp it desaturated toward black
instead of toward white. The shader now caps the pixel's distance from its
undersaturated knee point while preserving the direction of that offset, i.e.
it scales chroma and keeps hue, then clamps into gamut.

Verified:
- `npx tsc --noEmit` clean; `npm run build` clean.
- `node scripts/highlight-knee-check.mjs` (pins the new shader source and
  twin-tests 135 knob combinations) ok.
- Existing checks re-run green: `auto-tone-check`, `half-check`,
  `white-level-check`, `preview-match-check`, `library-check`,
  `scan-nav-check`, `roll-walk-check`.
- Live browser pass: rail shows exactly the seven expected tabs with no WB or
  FX; LIGHT renders 5 panels / 23 `data-key` knobs; 12 knobs report
  `min=-100 max=100`; everything else keeps its own range.
- Highlight hue measured on ten flat colour patches: HIGHLIGHT -100 gives a
  hue delta of 0.00 deg on every chromatic patch; HIGHLIGHT +100 stays within
  0.22 deg (sky) and 0.28 deg (magenta) wherever chroma survives, and the
  patches the ramp intentionally drives to white arrive fully neutral. Greys
  stay neutral (channel spread <= 2/255) at every knob setting. Skin patch
  before/after: 23.94 deg -> 0.00 deg.

ponytail: temperature (2500-10000 K), exposure (+-10 units at 0.25 EV each),
grain, grain size, hdf, vignette, rotate and crop deliberately keep their own
scales rather than the blanket -100..+100; widen them the day a user asks for
more range, not before. Hue assertions live in the flat-patch check because
real-photo measurements pick up 2-4 deg of resample drift from the snapshot
pipeline that has nothing to do with the shader.

Co-authored-by: PenguinHarness <noreply@penguin.local>

docker/frontend/src/ui/ToolRail.tsx

@@ -1,11 +1,12 @@
 import type { MsgKey } from '../i18n/vi';
 import { useI18n } from '../i18n/I18nProvider';
 
-// The app's eight tabs. WB leads LIGHT — white balance is the first thing the
-// eye corrects, and the web rail draws them in the order the panel opens. The
-// rail is a single column on desktop and becomes the bottom bar under 860px
-// (see styles/app.css).
-export type TabId = 'presets' | 'favorited' | 'photos' | 'wb' | 'light' | 'fx' | 'hsl' | 'frame' | 'save' | 'create';
+// The app's eight tabs. LIGHT is the develop column and holds every knob of the
+// picture — white balance, the tonal range, presence and the effects — so WB and
+// FX, which used to be tabs of their own, are panels of it now. The rail is a
+// single column on desktop and becomes the bottom bar under 860px (see
+// styles/app.css).
+export type TabId = 'presets' | 'favorited' | 'photos' | 'light' | 'hsl' | 'frame' | 'save' | 'create';
 
 // The build this bundle came from, put in by vite at build time and named by
 // whoever built the image (see vite.config.ts). Empty under a dev server.
@@ -15,9 +16,7 @@ export const TABS: { id: TabId; label: MsgKey; glyph: string }[] = [
   { id: 'presets', label: 'tab.presets', glyph: '◉' },
   { id: 'favorited', label: 'tab.favorited', glyph: '★' },
   { id: 'photos', label: 'tab.photos', glyph: '▤' },
-  { id: 'wb', label: 'tab.wb', glyph: '◐' },
   { id: 'light', label: 'tab.light', glyph: '☀' },
-  { id: 'fx', label: 'tab.fx', glyph: '✦' },
   // The HSL mixer sits with the colour tabs: it edits one hue band at a time.
   { id: 'hsl', label: 'tab.hsl', glyph: '◍' },
   { id: 'frame', label: 'tab.frame', glyph: '▣' },