Add deck synergy suggestions, a responsive deck layout, and undoable library bulk-add

Suggestion scoring is fully offline (tribal/mechanic/archetype/mana-base
signals derived at ingest, no external synergy database), with an "unusual
picks" mode that surfaces underappreciated cards instead of staples. The
deck page's top panels now use a CSS grid so wide windows don't waste
horizontal space. Library's bulk add-to-deck can clobber existing deck
quantities, so it now offers an undo (snackbar + command palette, the
latter with no timeout) that restores each card's prior state exactly.

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

crates/mtgc-core/src/sql/reference_schema.sql

@@ -13,7 +13,9 @@ CREATE TABLE IF NOT EXISTS oracle_cards (
     oracle_text    TEXT NOT NULL DEFAULT '',
     produced_mana      INTEGER NOT NULL DEFAULT 0,  -- WUBRG bitmask (lands/rocks/dorks)
     produces_colorless INTEGER NOT NULL DEFAULT 0,  -- boolean: can produce {C}
-    legalities         INTEGER NOT NULL DEFAULT 0   -- 2 bits/format x 8 formats, see model::LEGALITY_FORMATS
+    legalities         INTEGER NOT NULL DEFAULT 0,  -- 2 bits/format x 8 formats, see model::LEGALITY_FORMATS
+    themes             INTEGER NOT NULL DEFAULT 0,  -- archetype bitmask, see synergy::ARCHETYPES
+    edhrec_rank        INTEGER                      -- Scryfall EDHREC popularity rank; NULL if unranked
 );
 CREATE INDEX IF NOT EXISTS idx_oracle_name_lower ON oracle_cards(name_lower);
 CREATE INDEX IF NOT EXISTS idx_oracle_ci ON oracle_cards(color_identity);