feat: initial commit — local services (backend + manager dashboard + waiter PWA)

Includes all work to date:
- local_backend: FastAPI backend with products, orders, tables, shifts, cloud sync
- manager_dashboard: React manager UI with product/category management, reports, settings
- waiter_pwa: React PWA for waiter devices
- Category reparent endpoint and UI
- Waiter domain: local_ip sent on heartbeat, waiter_domain persisted from cloud response
- QR code modal in AppInfoTab for waiter domain
- Product form: number input spinners removed, category pre-selected on new product
- Category row: count badge moved to far right

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

local_backend/print_size_test.py

@@ -0,0 +1,137 @@
+"""
+Font size comparison test — Jolimark TP850UE
+Usage:  python print_size_test.py [IP] [PORT]
+Default: 10.98.20.25:9100
+
+Prints a single page showing all available size options side by side,
+to help decide which sizes to expose in the settings UI.
+
+Hardware facts:
+  ESC ! (0x1B 0x21 n):
+    0x10 = double-height only  (tall + narrow — breaks aspect ratio)
+    0x20 = double-width  only  (short + wide  — breaks aspect ratio)
+    0x30 = double-height + double-width (2x in both axes — correct aspect ratio)
+  There is NO 1.5x in ESC/POS hardware.
+  GS ! (0x1D 0x21 n) can go 3x, 4x … 8x but they are extremely large.
+"""
+import sys
+
+PRINTER_IP   = sys.argv[1] if len(sys.argv) > 1 else "10.98.20.25"
+PRINTER_PORT = int(sys.argv[2]) if len(sys.argv) > 2 else 9100
+
+try:
+    from escpos.printer import Network
+except ImportError:
+    print("escpos not installed. Run: pip install python-escpos")
+    sys.exit(1)
+
+def gr(text):
+    return text.encode('cp737', errors='replace')
+
+def raw(p, b):
+    p._raw(b)
+
+def section(p, title):
+    raw(p, b'\x1b\x21\x00')
+    raw(p, b'\x1b\x45\x00')
+    raw(p, b'\x1b\x61\x01')
+    p._raw(gr(f"--- {title} ---\n"))
+    raw(p, b'\x1b\x61\x00')
+
+def print_sample(p, esc_bang, gs_size, label_en, label_gr):
+    """Print one size sample with label."""
+    # Label at normal size
+    raw(p, b'\x1b\x21\x00')
+    raw(p, b'\x1b\x45\x00')
+    p._raw(gr(f"{label_en}:\n"))
+
+    # Apply size via ESC ! and/or GS !
+    if gs_size is not None:
+        raw(p, bytes([0x1d, 0x21, gs_size]))
+    raw(p, bytes([0x1b, 0x21, esc_bang]))
+
+    p._raw(gr(f"Club Sandwich. x1\n"))
+    p._raw(gr(f"* Χωρις αλατι\n"))
+    p._raw(gr(f"+ Extra Bacon x2\n"))
+
+    # Reset
+    raw(p, b'\x1d\x21\x00')
+    raw(p, b'\x1b\x21\x00')
+    raw(p, b'\n')
+
+def divider(p):
+    raw(p, b'\x1b\x21\x00')
+    p._raw(gr("-" * 48 + "\n"))
+
+print(f"Connecting to {PRINTER_IP}:{PRINTER_PORT}...")
+p = Network(PRINTER_IP, PRINTER_PORT, timeout=10)
+raw(p, b'\x1b\x40')        # ESC @ reset
+raw(p, b'\x1b\x74\x1d')    # CP737 Greek
+
+raw(p, b'\x1b\x61\x01')
+raw(p, b'\x1b\x21\x30')
+raw(p, b'\x1b\x45\x01')
+p._raw(gr("SIZE COMPARISON TEST\n"))
+raw(p, b'\x1b\x21\x00')
+raw(p, b'\x1b\x45\x00')
+raw(p, b'\x1b\x61\x00')
+p._raw(gr("Which sizes look good for ticket printing?\n\n"))
+
+# ── Section 1: The two aspect-ratio-correct options ───────────────────────
+section(p, "CORRECT ASPECT RATIO")
+p._raw(gr("\n"))
+
+print_sample(p,
+    esc_bang=0x00, gs_size=None,
+    label_en="[1] SMALL  (1x1 — normal)",
+    label_gr="")
+
+print_sample(p,
+    esc_bang=0x30, gs_size=None,
+    label_en="[2] LARGE  (2x2 — double height+width)",
+    label_gr="")
+
+# ── Section 2: The broken single-axis options (for comparison) ────────────
+divider(p)
+section(p, "BROKEN ASPECT RATIO (for comparison)")
+p._raw(gr("These scale only ONE axis — shown so\nyou can confirm they look wrong.\n\n"))
+
+print_sample(p,
+    esc_bang=0x10, gs_size=None,
+    label_en="[3] Tall only  (2x height, 1x width)",
+    label_gr="")
+
+print_sample(p,
+    esc_bang=0x20, gs_size=None,
+    label_en="[4] Wide only  (1x height, 2x width)",
+    label_gr="")
+
+# ── Section 3: GS ! options — 3x and beyond ──────────────────────────────
+divider(p)
+section(p, "GS! LARGER SIZES (3x3, 4x4)")
+p._raw(gr("These are technically available but\nvery large. Shown for completeness.\n\n"))
+
+print_sample(p,
+    esc_bang=0x00, gs_size=0x22,
+    label_en="[5] GS! 3x3",
+    label_gr="")
+
+print_sample(p,
+    esc_bang=0x00, gs_size=0x33,
+    label_en="[6] GS! 4x4",
+    label_gr="")
+
+# ── Conclusion ────────────────────────────────────────────────────────────
+divider(p)
+raw(p, b'\x1b\x61\x01')
+raw(p, b'\x1b\x21\x00')
+p._raw(gr("CONCLUSION:\n"))
+p._raw(gr("[1] Small = use for modifiers/notes\n"))
+p._raw(gr("[2] Large = use for item names/headers\n"))
+p._raw(gr("No true 1.5x exists in hardware.\n"))
+p._raw(gr("GS! 3x3/4x4 available if desired.\n"))
+
+raw(p, b'\n\n\n')
+p.cut()
+p.close()
+print("Done.")