web: import the camera's RAW, and grade it like the phone

The studio took JPEG, PNG and HEIC and nothing else, so a photographer's own
negatives never reached it. A RAW now loads the way any other file does —
`isRawName` reads the extension off a 24-entry list, the file goes into OPFS
under one slot (`current_image.raw`, beside `current_image.name`, so a reload
finds it again) and `rawDevelop` runs it through LibRaw-wasm: half size, 16-bit
output, camera white balance and the camera's own 3x3 matrix, in bands of 2M
pixels so a 30MB file never holds a second copy of itself. `example-sony.ARW`
(30.3MB) lands as a 3120x2084 picture, no page error.

DEHAZE joins the FX tab, where Lightroom keeps it: a chip off the same
PARAM_DEFS entry (`dehaze`, 0..10) so nothing new renders chips, and the pass is
the dark channel prior — `atmosphericLight` reads A off a 32x32 draw of the
photo, `DEHAZE_SKSL` takes omega up to 0.95 over a floor of 0.1 — measured at
71.8% of the stage's pixels moved between 0 and 10.

The gradient mask grows the six knobs the phone's has: HIGHLIGHT, SHADOW,
WHITE, BLACK, CLARITY and DEHAZE. The mask's falloff is a smoothstep rather than
a line, and CLARITY/DEHAZE inside a mask get a blurred copy of the photo plus
the air A as a second child of the mask shader — so a mask's clarity is clarity
and not a flat brightness lift. The column shows all nine rulers; CLARITY 9
moves 42.2% of the stage, DEHAZE 9 moves 27.9%.

CLARITY stops reading the whole photo per pixel: the single pass that sampled a
15x15 box 225 times is now the three passes the same math wants — 1x15, then
15x1, then a blend, `orig + (orig - B) * 3.2` — about 30 reads. Both signs work
(77.4% of the stage moves at +10, 79.6% at -10), and the negative branch keeps
its mist as it was.

The pointer reviews a look before it is taken: resting on a PHOTO STYLE chip or
a recipe chip lays that look on the photo while it stays there and gives it back
the moment it leaves — byte-identical, measured on four of them (24.9%, 23.8%,
24.5%, 25.3% of the stage moves on, 0.00% off) — while the recipe, the UNDO
stack and the session stay on the look the click left. A hovered look brings its
colour alone: the masks, the dust spots and the mosaic of the photo being edited
ride along, or a pointer crossing a chip row would rub them off. A PRO sim is
left out, since a hover that showed its look would hand over what the click
gates.

Probes: e2e-raw-verify, e2e-dehaze-mask, e2e-mask-verify, e2e-clarity-verify,
e2e-hover-preview2.

docker/frontend/package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "canvaskit-wasm": "^0.42.0",
         "exifr": "^7.1.3",
+        "libraw-wasm": "^1.6.0",
         "onnxruntime-web": "^1.30.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1"
@@ -1605,6 +1606,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/libraw-wasm": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/libraw-wasm/-/libraw-wasm-1.6.0.tgz",
+      "integrity": "sha512-VfvWq2XGGkc07wexymRLn1H82j6smmC1LAbVl41vnW2Z5RrEPLN+YHi1Hmga2TbxxrY4rOjmTwHwSyTZmypE1g==",
+      "license": "ISC"
+    },
     "node_modules/long": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",