fix: normalize app icon glyph sizing

assets/prod/app-icon.icon/icon.json

@@ -9,7 +9,7 @@
           "image-name": "text.svg",
           "name": "Text",
           "position": {
-            "scale": 10,
+            "scale": 8.5,
             "translation-in-points": [0, 0]
           }
         }

scripts/lib/icon-source-consistency.test.ts

@@ -0,0 +1,52 @@
+// @effect-diagnostics nodeBuiltinImport:off - Tests compare static icon source files directly.
+import * as NodeFS from "node:fs";
+import * as NodePath from "node:path";
+import * as NodeURL from "node:url";
+
+import { describe, expect, it } from "vite-plus/test";
+
+const REPOSITORY_ROOT = NodePath.join(
+  NodePath.dirname(NodeURL.fileURLToPath(import.meta.url)),
+  "..",
+  "..",
+);
+const ICON_PROJECTS = ["dev", "nightly", "prod"].map((variant) =>
+  NodePath.join(REPOSITORY_ROOT, "assets", variant, "app-icon.icon"),
+);
+
+interface IconLayer {
+  readonly name?: string;
+  readonly position?: {
+    readonly scale?: number;
+    readonly "translation-in-points"?: ReadonlyArray<number>;
+  };
+}
+
+interface IconProject {
+  readonly groups?: ReadonlyArray<{ readonly layers?: ReadonlyArray<IconLayer> }>;
+}
+
+const readTextLayer = (projectPath: string) => {
+  const project = JSON.parse(
+    NodeFS.readFileSync(NodePath.join(projectPath, "icon.json"), "utf8"),
+  ) as IconProject;
+  return project.groups
+    ?.flatMap((group) => group.layers ?? [])
+    .find((layer) => layer.name === "Text");
+};
+
+describe("icon sources", () => {
+  it("keeps the visible T3 mark identical across all app variants", () => {
+    const textSources = ICON_PROJECTS.map((projectPath) =>
+      NodeFS.readFileSync(NodePath.join(projectPath, "Assets", "text.svg"), "utf8"),
+    );
+
+    expect(new Set(textSources).size).toBe(1);
+    for (const projectPath of ICON_PROJECTS) {
+      expect(readTextLayer(projectPath)?.position).toEqual({
+        scale: 8.5,
+        "translation-in-points": [0, 0],
+      });
+    }
+  });
+});