Initial codebase: Go + Wails amateur radio logbook

Backend (Go 1.25 / Wails v2):
- QSO storage on SQLite (modernc) with embedded migrations (0001..0005)
- Streaming ADIF import (batch insert) + WorkedBefore per callsign and DXCC
- Callsign lookup with QRZ.com + HamQTH providers (primary/failsafe routing)
  and SQLite-backed TTL cache
- DXCC resolver from cty.dat (auto-download, longest-prefix-match)
- Multi-profile operator identities (home/portable/SOTA/contest) — every
  QSO stamps MY_* from the active profile
- CAT control via OmniRig COM on a single OS-locked goroutine, with
  bidirectional sync (freq/mode/band/split/VFOs) and Rig1/Rig2 hot-swap
- Settings store (key/value), CAT debug log at %APPDATA%/HamLog/cat.log

Frontend (React 18 + TypeScript + Tailwind v4 + shadcn-style):
- Single-row entry strip with CAT-aware band/mode/freq, RST, Start/End
  UTC, per-field locks (band/mode/freq/start/end) for backdated QSOs
- Topbar: live freq (MHz.kHz.Hz dotted), live UTC, band/mode/SPLIT badges,
  CAT pill with rig selector and clickable Azimuth pill (rotor TODO)
- Settings tree: Profiles (Log4OM-style manager), Station Information
  (edits the active profile), unified Callsign Lookup with Test buttons,
  Bands/Modes lists, CAT
- Worked-before matrix (band × mode × class) with new-DXCC highlighting
- ADIF import from menu + Maintenance > Refresh cty.dat

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

frontend/src/style.css

@@ -0,0 +1,72 @@
+/* External @imports must come first per CSS spec. */
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');
+@import "tailwindcss";
+@import "tw-animate-css";
+
+/* ===== Cream & warm-orange palette =====
+   Background : warm cream (subtle beige, less cold than stone)
+   Accent     : burnt orange (signal-lamp vibe, classic radio amateur)
+   Status     : muted emerald / amber / rose
+   The BandSlotGrid cells keep their emerald+indigo independently — that
+   colour code conveys QSO status semantics, not app branding.
+*/
+@theme {
+  --color-background: #faf6ed;        /* warm cream */
+  --color-foreground: #1c1917;        /* stone-900 */
+
+  --color-card: #ffffff;
+  --color-card-foreground: #1c1917;
+
+  --color-popover: #ffffff;
+  --color-popover-foreground: #1c1917;
+
+  --color-primary: #c2410c;           /* orange-700 — burnt orange */
+  --color-primary-foreground: #fff7ed;
+
+  --color-secondary: #f5efe0;         /* warmer secondary surface */
+  --color-secondary-foreground: #1c1917;
+
+  --color-muted: #f5efe0;
+  --color-muted-foreground: #57534e;  /* stone-600 */
+
+  --color-accent: #ffedd5;            /* orange-100 — light cream-orange */
+  --color-accent-foreground: #9a3412; /* orange-800 */
+
+  --color-destructive: #b91c1c;       /* red-700, classic brick */
+  --color-destructive-foreground: #ffffff;
+
+  --color-border: #e7dfd0;            /* warm beige border */
+  --color-input: #e7dfd0;
+  --color-ring: #ea580c;              /* orange-600 — focus ring */
+
+  --color-ok: #15803d;                /* emerald-700 — slightly deeper */
+  --color-warn: #b45309;              /* amber-700 */
+
+  --radius: 0.5rem;
+
+  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  --font-mono: 'JetBrains Mono', 'Cascadia Mono', Consolas, 'Courier New', monospace;
+}
+
+@layer base {
+  * { @apply border-border; }
+  html, body, #root { height: 100%; }
+  body {
+    @apply bg-background text-foreground;
+    font-family: var(--font-sans);
+    font-size: 13px;
+    line-height: 1.45;
+    -webkit-font-smoothing: antialiased;
+    text-rendering: optimizeLegibility;
+  }
+}
+
+/* Warm scrollbar */
+::-webkit-scrollbar { width: 10px; height: 10px; }
+::-webkit-scrollbar-track { background: transparent; }
+::-webkit-scrollbar-thumb {
+  background: #d6cbb1;
+  border-radius: 5px;
+  border: 2px solid var(--color-background);
+}
+::-webkit-scrollbar-thumb:hover { background: #b3a47d; }