P6: placeholder icon, README, packaged build verified

- assets/icon.png (generated by scripts/make-icon.py) + icon.iconset
  (scripts/gen-iconset.sh); electrobun compiles it to AppIcon.icns
- branding.icon points at the iconset
- README: features, stack, dev/build, rebranding, plaintext-password warning,
  shortcuts, v1 scope
- verified: full production build (ng build + electrobun build) produces a
  launchable BunSCP.app that boots standalone from views://app

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/make-icon.py

@@ -0,0 +1,103 @@
+#!/usr/bin/env python3
+"""Generate a placeholder app icon (1024x1024 PNG) with a dual-panel + transfer
+motif. No third-party deps — raw RGBA encoded via zlib. Replace assets/icon.png
+(and re-run scripts/gen-iconset.sh) to rebrand."""
+import struct
+import zlib
+import sys
+
+N = 1024
+
+
+def lerp(a, b, t):
+    return tuple(round(a[i] + (b[i] - a[i]) * t) for i in range(3))
+
+
+def rounded_rect_alpha(x, y, x0, y0, x1, y1, r):
+    """Coverage (0..1) for a rounded rect with ~1px antialiasing."""
+    # distance outside the rect's rounded boundary
+    dx = max(x0 + r - x, 0, x - (x1 - r))
+    dy = max(y0 + r - y, 0, y - (y1 - r))
+    if x < x0 or x > x1 or y < y0 or y > y1:
+        return 0.0
+    # corner regions
+    cx = None
+    if x < x0 + r and y < y0 + r:
+        cx, cy = x0 + r, y0 + r
+    elif x > x1 - r and y < y0 + r:
+        cx, cy = x1 - r, y0 + r
+    elif x < x0 + r and y > y1 - r:
+        cx, cy = x0 + r, y1 - r
+    elif x > x1 - r and y > y1 - r:
+        cx, cy = x1 - r, y1 - r
+    if cx is not None:
+        d = ((x - cx) ** 2 + (y - cy) ** 2) ** 0.5
+        return max(0.0, min(1.0, r - d + 0.5))
+    return 1.0
+
+
+BG_TOP = (0x4F, 0x46, 0xE5)      # indigo-600
+BG_BOT = (0x18, 0x18, 0x1B)      # zinc-900
+PANEL = (0xFA, 0xFA, 0xFA)       # near white
+ROW = (0xC7, 0xCC, 0xD6)
+ARROW = (0xFB, 0xBF, 0x24)       # amber-400
+
+buf = bytearray()
+margin = 96
+radius = 205
+# panels
+pgap = 70
+ptop = 340
+pbot = 760
+pw = (N - 2 * 300 - pgap) / 2
+lx0 = 300
+lx1 = lx0 + pw
+rx0 = lx1 + pgap
+rx1 = rx0 + pw
+
+for y in range(N):
+    buf.append(0)  # PNG filter byte per scanline
+    for x in range(N):
+        outer = rounded_rect_alpha(x + 0.5, y + 0.5, margin, margin, N - margin, N - margin, radius)
+        t = y / N
+        col = lerp(BG_TOP, BG_BOT, t)
+        r, g, b = col
+        a = outer
+        # panels
+        for (x0, x1) in ((lx0, lx1), (rx0, rx1)):
+            pa = rounded_rect_alpha(x + 0.5, y + 0.5, x0, ptop, x1, pbot, 34)
+            if pa > 0:
+                r = round(r * (1 - pa) + PANEL[0] * pa)
+                g = round(g * (1 - pa) + PANEL[1] * pa)
+                b = round(b * (1 - pa) + PANEL[2] * pa)
+                # file rows
+                for row in range(4):
+                    ry = ptop + 70 + row * 74
+                    if ry <= y <= ry + 26 and x0 + 34 <= x <= x1 - 34:
+                        r, g, b = ROW
+        # transfer arrows in the gap
+        cx0, cx1 = lx1 + 6, rx0 - 6
+        midy = (ptop + pbot) / 2
+        if cx0 <= x <= cx1 and abs(y - midy) < 90:
+            # two chevrons pointing right and left, forming <-> feel
+            rel = (x - cx0) / (cx1 - cx0)
+            band = abs(y - midy)
+            if band < 46 - abs(rel - 0.5) * 40:
+                r, g, b = ARROW
+                a = max(a, outer)
+        buf.extend((r, g, b, round(255 * a)))
+
+
+def chunk(tag, data):
+    return struct.pack(">I", len(data)) + tag + data + struct.pack(">I", zlib.crc32(tag + data) & 0xFFFFFFFF)
+
+
+png = b"\x89PNG\r\n\x1a\n"
+png += chunk(b"IHDR", struct.pack(">IIBBBBB", N, N, 8, 6, 0, 0, 0))
+png += chunk(b"IDAT", zlib.compress(bytes(buf), 9))
+png += chunk(b"IEND", b"")
+
+out = sys.argv[1] if len(sys.argv) > 1 else "assets/icon.png"
+with open(out, "wb") as f:
+    f.write(png)
+print(f"wrote {out} ({N}x{N})")