feat: proper logo, favicon, and pwa icons

- replace placeholder house svg with clean geometric house mark
  on indigo-700 (#4338CA) — roof triangle, body, door cutout
- add favicon.svg with prefers-color-scheme dark variant
- add icon-16/32 sizes; regenerate all pngs from svg via sharp
- update BrandMark component to use inline svg house instead of 'f'
- wire favicon + sized pngs into layout metadata
- fix middleware to allow icon/manifest/favicon paths without auth
  (android launcher fetches icons in a cookieless system context)
- fix getCurrentSession() to redirect to /login instead of throwing
  when session cookie is stale/invalid

scripts/generate-icons.mjs

@@ -1,100 +1,48 @@
 /**
- * Generates placeholder PNG icons for the famapp PWA.
+ * Rasterizes public/icon.svg into all required PNG icon sizes.
  *
  * Usage: node scripts/generate-icons.mjs
  *
  * Produces:
+ *   public/icon-16.png
+ *   public/icon-32.png
+ *   public/icon-180.png           (apple-touch-icon)
  *   public/icon-192.png
  *   public/icon-384.png
  *   public/icon-512.png
- *   public/icon-512-maskable.png  (same image; OS applies its own mask)
- *   public/icon-180.png           (apple-touch-icon)
- *
- * All images are solid indigo (#4F46E5) squares — replace with a real
- * branded export from icon.svg when assets are finalised.
+ *   public/icon-512-maskable.png  (square bg, content in safe zone)
  */
 
-import { deflateSync } from "zlib";
-import { writeFileSync } from "fs";
-import { resolve, dirname } from "path";
+import sharp from "sharp";
+import { readFileSync } from "fs";
 import { fileURLToPath } from "url";
+import { dirname, join } from "path";
 
-const __dir = dirname(fileURLToPath(import.meta.url));
-const publicDir = resolve(__dir, "../public");
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const pub = join(__dirname, "..", "public");
 
-// Build CRC-32 lookup table once.
-const CRC_TABLE = new Uint32Array(256);
-for (let i = 0; i < 256; i++) {
-  let c = i;
-  for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
-  CRC_TABLE[i] = c;
-}
+const svg = readFileSync(join(pub, "icon.svg"));
 
-function crc32(buf) {
-  let crc = 0xffffffff;
-  for (let i = 0; i < buf.length; i++) crc = CRC_TABLE[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8);
-  return (crc ^ 0xffffffff) >>> 0;
-}
-
-function u32(n) {
-  const b = Buffer.alloc(4);
-  b.writeUInt32BE(n, 0);
-  return b;
-}
-
-function pngChunk(type, data) {
-  const typeBytes = Buffer.from(type, "ascii");
-  const crc = u32(crc32(Buffer.concat([typeBytes, data])));
-  return Buffer.concat([u32(data.length), typeBytes, data, crc]);
-}
-
-/**
- * Returns a Buffer containing a valid PNG of size×size filled with (r, g, b).
- */
-function solidPNG(size, r, g, b) {
-  const PNG_SIG = Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]);
-
-  const ihdr = pngChunk(
-    "IHDR",
-    Buffer.concat([
-      u32(size),
-      u32(size),
-      Buffer.from([8, 2, 0, 0, 0]), // 8-bit RGB, no interlace
-    ]),
-  );
-
-  // One filter byte (0 = None) followed by size×3 RGB bytes per row.
-  const rowLen = 1 + size * 3;
-  const raw = Buffer.alloc(size * rowLen);
-  for (let y = 0; y < size; y++) {
-    const base = y * rowLen;
-    raw[base] = 0;
-    for (let x = 0; x < size; x++) {
-      raw[base + 1 + x * 3] = r;
-      raw[base + 2 + x * 3] = g;
-      raw[base + 3 + x * 3] = b;
-    }
-  }
-
-  const idat = pngChunk("IDAT", deflateSync(raw));
-  const iend = pngChunk("IEND", Buffer.alloc(0));
-
-  return Buffer.concat([PNG_SIG, ihdr, idat, iend]);
-}
-
-// Indigo-600 (#4F46E5)
-const [R, G, B] = [0x4f, 0x46, 0xe5];
-
-const icons = [
+const sizes = [
+  { name: "icon-16.png", size: 16 },
+  { name: "icon-32.png", size: 32 },
+  { name: "icon-180.png", size: 180 },
   { name: "icon-192.png", size: 192 },
   { name: "icon-384.png", size: 384 },
   { name: "icon-512.png", size: 512 },
-  { name: "icon-512-maskable.png", size: 512 },
-  { name: "icon-180.png", size: 180 },
 ];
 
-for (const { name, size } of icons) {
-  const out = resolve(publicDir, name);
-  writeFileSync(out, solidPNG(size, R, G, B));
+for (const { name, size } of sizes) {
+  await sharp(svg).resize(size, size).png().toFile(join(pub, name));
   console.log(`  ✓  public/${name}  (${size}×${size})`);
 }
+
+// Maskable: remove rounded corners so the background fills the full canvas,
+// allowing the OS to apply any mask shape without clipping the icon corners.
+const maskableSvg = readFileSync(join(pub, "icon.svg"), "utf-8").replace('rx="96"', "");
+
+await sharp(Buffer.from(maskableSvg))
+  .resize(512, 512)
+  .png()
+  .toFile(join(pub, "icon-512-maskable.png"));
+console.log(`  ✓  public/icon-512-maskable.png  (512×512 maskable)`);