feat(rack): add shift-click context modal for connections with color and edge type configurability

prisma/migrations/20260323023033_add_edge_type_to_connection/migration.sql

@@ -0,0 +1,20 @@
+-- RedefineTables
+PRAGMA defer_foreign_keys=ON;
+PRAGMA foreign_keys=OFF;
+CREATE TABLE "new_Connection" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "fromPortId" TEXT NOT NULL,
+    "toPortId" TEXT NOT NULL,
+    "color" TEXT,
+    "label" TEXT,
+    "edgeType" TEXT NOT NULL DEFAULT 'bezier',
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "Connection_fromPortId_fkey" FOREIGN KEY ("fromPortId") REFERENCES "Port" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "Connection_toPortId_fkey" FOREIGN KEY ("toPortId") REFERENCES "Port" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+INSERT INTO "new_Connection" ("color", "createdAt", "fromPortId", "id", "label", "toPortId") SELECT "color", "createdAt", "fromPortId", "id", "label", "toPortId" FROM "Connection";
+DROP TABLE "Connection";
+ALTER TABLE "new_Connection" RENAME TO "Connection";
+CREATE UNIQUE INDEX "Connection_fromPortId_toPortId_key" ON "Connection"("fromPortId", "toPortId");
+PRAGMA foreign_keys=ON;
+PRAGMA defer_foreign_keys=OFF;

prisma/schema.prisma

@@ -67,6 +67,7 @@ model Connection {
   toPort       Port     @relation("TargetPort", fields: [toPortId], references: [id], onDelete: Cascade)
   color        String?  // Optional custom cable color
   label        String?  // Optional cable label (e.g. "Cable #104")
+  edgeType     String   @default("bezier") // bezier | straight | step
   createdAt    DateTime @default(now())
 
   @@unique([fromPortId, toPortId])