Let the signed-out sample reach a video result

proof/demo-video/README.md

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+# Signed-out sample run — video result
+
+Proof that a signed-out visitor who adds an Image→Video node to the starter graph gets a real
+video result, and that the run costs nothing.
+
+## Run it
+
+```
+node proof/demo-video/verify-demo-video.mjs
+```
+
+The check is offline and deterministic. It serves the worktree, starts Microsoft Edge in headless
+mode, and drives the real `index.html` through CDP. It blocks the whole `nano-gpt.com` origin, and
+it records each request that the page tries to make. The run must show 36 passed, 0 failed.
+
+The check makes these statements, and it tests each one:
+
+- The starter graph, and the starter graph plus one Image→Video node, are both sample runs.
+- The run-cost chip stays visible in a sample run. It reads `~$X to run for real`.
+- The chip figure increases when the visitor adds the video node. The video node also shows its
+  own price.
+- All 4 nodes finish. The video node output is a `data:video/mp4` URL. The clip decodes to
+  640x360 and 5.04 s.
+- The result carries the `✨ sample result` badge. The ⬇ save and ↗ open buttons are present.
+- The pill says that the clip is a canned example and that it ignores the visitor's prompt.
+- `sw.js` does not precache the clip. The service-worker fetch handler caches it at first use,
+  and the cached bytes are the shipped file.
+- The page calls no billable endpoint. No request reaches `nano-gpt.com`. The sample run finishes
+  with the API unreachable.
+
+## The catalog fixture
+
+`catalog-fixture.json` holds 3 normalized catalog entries: the two models of the starter graph, and
+the model that an appended Image→Video node selects. The check puts them in `localStorage`, because
+the run-cost chip needs prices and the network is off.
+
+To record the fixture again:
+
+```
+node proof/demo-video/verify-demo-video.mjs --capture
+```
+
+This is the only mode that contacts `nano-gpt.com`. It reads the free public model lists
+(`GET /api/v1/{models,image-models,video-models}`) and takes the entries from the app's own
+`localStorage` cache, so the shape cannot differ from the app's normalizers. It never runs a graph,
+and it spends nothing. Prices change, so record the fixture again instead of an edit by hand.
+
+## The clip
+
+`demo-sample.mp4` in the repository root is a real clip. `scripts/gen-demo-clip.mjs` renders it from
+the shipped `demo-sample.jpg` and records the model and the cost.

proof/demo-video/catalog-fixture.json

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+{
+  "note": "Normalized catalog entries for the 3 models the covered demo path uses, read out of the app's own localStorage cache. Re-record with --capture; prices move.",
+  "captured": "2026-07-30",
+  "catalogs": {
+    "chat": [
+      {
+        "id": "zai-org/glm-5.2",
+        "name": "GLM 5.2",
+        "created": 1781481600,
+        "sortUsd": 0.00108,
+        "vision": false,
+        "nsfw": false,
+        "reasoning": true,
+        "structured_output": true,
+        "audio_input": false,
+        "video_input": false,
+        "pdf_upload": false,
+        "maxOut": 131072,
+        "promptUsd1M": 0.42000000000000004,
+        "completionUsd1M": 1.32,
+        "price": "$0.42/$1.32 ·1M"
+      }
+    ],
+    "image": [
+      {
+        "id": "nano-banana-2-lite",
+        "name": "Nano Banana 2 Lite",
+        "created": 1782777600,
+        "sortUsd": 0.04,
+        "edit": true,
+        "gen": true,
+        "inpaint": false,
+        "maxIn": 14,
+        "lora": false,
+        "resolutions": [
+          "1k"
+        ],
+        "maxOut": 4,
+        "fixedCount": 0,
+        "sizePrices": {
+          "1k": 0.04,
+          "auto": 0.04
+        },
+        "nsfw": false,
+        "price": "$0.040/img"
+      }
+    ],
+    "video": [
+      {
+        "id": "google/gemini-omni-flash",
+        "name": "Gemini Omni Flash",
+        "created": 1782777600,
+        "sortUsd": 1.04,
+        "t2v": true,
+        "i2v": true,
+        "v2v": true,
+        "avatar": false,
+        "lora": false,
+        "audioGen": false,
+        "params": {
+          "duration": {
+            "label": "Duration",
+            "description": "Video duration in seconds",
+            "type": "select",
+            "options": [
+              {
+                "value": "3",
+                "label": "3 seconds"
+              },
+              {
+                "value": "4",
+                "label": "4 seconds"
+              },
+              {
+                "value": "5",
+                "label": "5 seconds"
+              },
+              {
+                "value": "6",
+                "label": "6 seconds"
+              },
+              {
+                "value": "7",
+                "label": "7 seconds"
+              },
+              {
+                "value": "8",
+                "label": "8 seconds"
+              },
+              {
+                "value": "9",
+                "label": "9 seconds"
+              },
+              {
+                "value": "10",
+                "label": "10 seconds"
+              }
+            ],
+            "default": "8"
+          },
+          "aspect_ratio": {
+            "label": "Aspect Ratio",
+            "description": "Output aspect ratio",
+            "type": "select",
+            "options": [
+              {
+                "value": "16:9",
+                "label": "Landscape (16:9)"
+              },
+              {
+                "value": "9:16",
+                "label": "Portrait (9:16)"
+              }
+            ],
+            "default": "16:9"
+          }
+        },
+        "defaults": {
+          "duration": "8",
+          "aspect_ratio": "16:9"
+        },
+        "pricing": {
+          "currency": "USD",
+          "per_second_by_mode": {
+            "text_to_video": 0.13,
+            "image_to_video": 0.14,
+            "reference_to_video": 0.16,
+            "video_edit": 0.16
+          },
+          "default_duration": 8,
+          "supported_durations": [
+            3,
+            4,
+            5,
+            6,
+            7,
+            8,
+            9,
+            10
+          ]
+        },
+        "nsfw": false,
+        "price": "~$1.04/clip"
+      }
+    ]
+  }
+}