Let each install pick its app icon

Settings > General gets an App icon (super admin): one of the seven
stones, or an uploaded image with the picked stone as a top-left corner
mark (inside a round launcher's crop, clear of the browser's badge),
previewed in both launcher crops before saving.

Uploads are decoded and cropped to a stored square (no SVG); the set is
drawn into DATA_DIR/install-icon/<version>/ and served publicly and
immutable. The manifest, head icon links and push notifications point at
it; the ember stone keeps the stock icons. The generator shares the icon
renderer.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/schemas/install-schema.ts

@@ -0,0 +1,20 @@
+import { z } from "zod";
+import { BotHues } from "@/src/dict/bot-dict";
+import { PwaInstallIconModes, PwaInstallNameMaxLength } from "@/src/data/pwa-data";
+
+export const SaveInstallNameRequestSchema = z.object({
+    install_name: z.string().trim().max(PwaInstallNameMaxLength),
+});
+
+export const SaveInstallIconRequestSchema = z.object({
+    mode: z.enum(PwaInstallIconModes),
+    stone: z.enum(BotHues.map((hue) => hue.value) as [string, ...string[]], "Pick a stone"),
+    mark: z.boolean(),
+    /**
+     * A newly picked image as a base64 data URL; omitted to keep the
+     * stored one.
+     */
+    data_url: z.string().startsWith("data:image/", "Send the image as a data URL").nullish(),
+});
+
+export type SaveInstallIconRequest = z.infer<typeof SaveInstallIconRequestSchema>;