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/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "mtgc-core"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Platform-agnostic core for the MTG library catalog: DB, fuzzy search, filters, decks, and Scryfall ingestion."
+
+[lib]
+name = "mtgc_core"
+path = "src/lib.rs"
+
+# Binary that builds reference.db from Scryfall bulk data.
+[[bin]]
+name = "mtgc-ingest"
+path = "src/bin/ingest.rs"
+
+[dependencies]
+rusqlite = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+nucleo = { workspace = true }
+ureq = { workspace = true }
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+
+[dev-dependencies]
+tempfile = "3"