feat: add Goldfish Recap YouTube summary PWA

YouTube subtitles via OpenRouter become persistent, shareable recaps
with timestamp jump links, PIN-protected creation, and Traefik deploy.

Co-authored-by: Cursor <cursoragent@cursor.com>

tools/gen_favicon.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+"""Generate PNG icons from SVG for PWA."""
+
+from __future__ import annotations
+
+import pathlib
+import struct
+import zlib
+
+ROOT = pathlib.Path(__file__).resolve().parents[1]
+SVG = ROOT / "public" / "icon.svg"
+
+
+def _png_chunk(tag: bytes, data: bytes) -> bytes:
+    return struct.pack(">I", len(data)) + tag + data + struct.pack(">I", zlib.crc32(tag + data) & 0xFFFFFFFF)
+
+
+def write_simple_png(path: pathlib.Path, size: int) -> None:
+    """Minimal orange/blue square PNG — no external deps."""
+    raw_rows = []
+    for y in range(size):
+        row = b"\x00"
+        for x in range(size):
+            cx, cy = size / 2, size / 2
+            dist = ((x - cx) ** 2 + (y - cy) ** 2) ** 0.5
+            if dist < size * 0.42:
+                row += bytes([255, 159, 67])  # orange fish body
+            elif y < size * 0.15 or y > size * 0.92:
+                row += bytes([11, 61, 92])
+            else:
+                row += bytes([11, 61, 92])
+        raw_rows.append(row)
+    compressed = zlib.compress(b"".join(raw_rows), 9)
+    ihdr = struct.pack(">IIBBBBB", size, size, 8, 2, 0, 0, 0)
+    png = b"\x89PNG\r\n\x1a\n"
+    png += _png_chunk(b"IHDR", ihdr)
+    png += _png_chunk(b"IDAT", compressed)
+    png += _png_chunk(b"IEND", b"")
+    path.write_bytes(png)
+
+
+def main() -> None:
+    out = ROOT / "public" / "icon-192.png"
+    write_simple_png(out, 192)
+    print(f"Wrote {out}")
+
+
+if __name__ == "__main__":
+    main()