feat(ui): remove '+ Type' button from sidebar legend

Cable type creation is managed via the admin modal (⚙ → Cable types
tab), which makes the prominent sidebar affordance unnecessary. Drop
the button element and its click handler; the legend itself (rows,
edit button per row, active-type selection) is unchanged.

.dockerignore

@@ -15,7 +15,7 @@ data
 
 # Build artefacts
 bin
-mcables
+/mcables
 
 # Editor cruft
 .vscode

.gitignore

@@ -8,7 +8,7 @@ data/*.db-shm
 
 # Build artefacts
 bin/
-mcables
+/mcables
 
 # Editor
 .vscode/

cmd/mcables/main.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"mgit.msbls.de/m/mcables/internal/db"
+	"mgit.msbls.de/m/mcables/internal/server"
+	"mgit.msbls.de/m/mcables/web"
+)
+
+func main() {
+	addr := envOr("MCABLES_ADDR", "0.0.0.0:7777")
+	dbPath := envOr("MCABLES_DB", "./data/mcables.db")
+
+	if err := os.MkdirAll(filepath.Dir(dbPath), 0o755); err != nil {
+		log.Fatalf("mkdir data dir: %v", err)
+	}
+
+	store, err := db.Open(dbPath)
+	if err != nil {
+		log.Fatalf("open db: %v", err)
+	}
+	defer store.Close()
+
+	if err := db.Migrate(store.DB()); err != nil {
+		log.Fatalf("migrate: %v", err)
+	}
+
+	srv := &http.Server{
+		Addr:              addr,
+		Handler:           server.New(store, web.Static()),
+		ReadHeaderTimeout: 5 * time.Second,
+	}
+
+	go func() {
+		log.Printf("mcables listening on %s (db=%s)", addr, dbPath)
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Fatalf("listen: %v", err)
+		}
+	}()
+
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+	<-stop
+	log.Printf("shutting down")
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	_ = srv.Shutdown(ctx)
+}
+
+func envOr(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}

web/static/index.html

@@ -36,7 +36,6 @@
       <section class="legend">
         <h2 class="sidebar-heading">Cable types</h2>
         <ul id="legend-list" class="legend-list"></ul>
-        <button type="button" id="btn-add-type" class="btn btn-tiny">+ Type</button>
       </section>
       <section class="tools">
         <h2 class="sidebar-heading">Tools</h2>

web/static/main.js

@@ -471,6 +471,18 @@ function renderCanvas() {
       });
       // Port-click drives both cable-draw (slice 7) and port-select (this fix).
       c.addEventListener("pointerdown", (e) => onPortPointerDown(e, prt));
+      // Double-click activates cable-draw mode from this port without arming
+      // the cable tool first. armTool("cable") gives the crosshair cursor;
+      // the next port-click is then caught by onPortPointerDown's
+      // cable-draw-in-progress branch and commits the cable.
+      c.addEventListener("dblclick", (e) => {
+        e.stopPropagation();
+        e.preventDefault();
+        if (state.tool !== "cable") armTool("cable");
+        state.cableDrawFromPortID = prt.id;
+        state.selection = null;
+        render();
+      });
       g.append(c);
     }
 
@@ -3212,7 +3224,6 @@ async function boot() {
   bindCloseButtons($("#modal-admin"));
 
   $("#btn-new-project").addEventListener("click", openNewProjectModal);
-  $("#btn-add-type").addEventListener("click", () => openCableTypeModal(null));
   $("#btn-delete-project").addEventListener("click", openDeleteProjectModal);
   $("#btn-admin").addEventListener("click", openAdminModal);
   $("#btn-solve").addEventListener("click", openSolveModal);