Initial commit: MTG personal library catalog (Tauri v2 + React/TS)

Full working app with:
- Rust core (mtgc-core): Scryfall ingester, nucleo fuzzy search, SQLite two-DB
  architecture (reference.db + library.db via ATTACH), criteria filters, deck ops
- Tauri v2 shell exposing the core as typed IPC commands
- React/TS frontend: card entry, library browser, deck editor
- Features: fuzzy card search, color/CMC/type/commander-identity filters,
  tile/list view toggle, hover card previews, deck format + commander support,
  per-card location field, grouping by type/subtype/CMC/color, localStorage
  persistence for active tab/deck/grouping, Discord-inspired dark UI (#C8553D accent)

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

crates/mtgc-core/src/bin/ingest.rs

@@ -0,0 +1,28 @@
+//! CLI: build reference.db from Scryfall bulk data.
+//!
+//! Usage: `mtgc-ingest [path/to/reference.db]` (defaults to ./reference.db)
+
+use std::path::PathBuf;
+use std::process::ExitCode;
+
+fn main() -> ExitCode {
+    let dest = std::env::args()
+        .nth(1)
+        .map(PathBuf::from)
+        .unwrap_or_else(|| PathBuf::from("reference.db"));
+
+    eprintln!("Building reference db at {}", dest.display());
+    match mtgc_core::ingest::build_reference_db(&dest, |msg| eprintln!("  {msg}")) {
+        Ok(stats) => {
+            eprintln!(
+                "Done: {} oracle cards, {} printings.",
+                stats.oracle_cards, stats.printings
+            );
+            ExitCode::SUCCESS
+        }
+        Err(e) => {
+            eprintln!("Ingest failed: {e}");
+            ExitCode::FAILURE
+        }
+    }
+}