Fix wire property persistence and enable server auto-reload

Wire options (twisted pair, shielded, stripe, bundle) were not
persisting because the backend server had stale Python modules loaded
from before the WireUpdate schema was updated with these fields.
Pydantic silently ignored unrecognized fields, so only pre-existing
fields like color_stripe were saved.

Frontend fixes applied alongside the schema work:
- _patchWire now shows visible error on save failure instead of
  swallowing errors and falsely flashing Saved
- Bundle dropdown rebuild is guarded with _updatingBundleDropdown flag
  to prevent spurious change events from triggering unwanted PATCHes
- Enable uvicorn reload=True so server auto-restarts on code changes,
  preventing stale module issues in the future

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

backend/run.py

@@ -1,4 +1,4 @@
 import uvicorn
 
 if __name__ == "__main__":
-    uvicorn.run("app.main:app", host="127.0.0.1", port=8000, reload=False)
+    uvicorn.run("app.main:app", host="127.0.0.1", port=8000, reload=True)

frontend/js/app.js

@@ -10,6 +10,7 @@ class WiringApp {
     this._preDrag = null;          // snapshot captured at dragstart for undo
     this._octopartReady = null;    // null=unknown, true/false after status check
     this._bundles = [];            // wire bundles for current diagram
+    this._updatingBundleDropdown = false;
 
     this.canvas = new DiagramCanvas("canvas-container", {
       onDeviceSelected:   (d)                      => this._showDeviceProps(d),
@@ -62,11 +63,26 @@ class WiringApp {
     this._savedTimer = setTimeout(() => {
       const el = document.getElementById("saved-indicator");
       if (!el) return;
+      el.textContent = "✓ Saved";
+      el.style.color = "";
       el.classList.add("show");
       setTimeout(() => el.classList.remove("show"), 1400);
     }, 600);
   }
 
+  _flashError() {
+    clearTimeout(this._savedTimer);
+    const el = document.getElementById("saved-indicator");
+    if (!el) return;
+    el.textContent = "✗ Save failed";
+    el.style.color = "#e06c6c";
+    el.classList.add("show");
+    this._savedTimer = setTimeout(() => {
+      el.classList.remove("show");
+      el.style.color = "";
+    }, 3000);
+  }
+
   // ── Undo ──────────────────────────────────────────────────────────────────────
 
   _pushUndo(fn) {
@@ -599,6 +615,7 @@ class WiringApp {
     });
 
     document.getElementById("wire-bundle-select")?.addEventListener("change", (e) => {
+      if (this._updatingBundleDropdown) return;
       const bundleId = e.target.value ? parseInt(e.target.value) : null;
       this._patchWire({ bundle_id: bundleId }, true);
       this._refreshBundleEditPanel(bundleId);
@@ -708,8 +725,13 @@ class WiringApp {
       Object.assign(w, data);
       if (redraw) this.canvas.updateWire(w);
     }
-    await api.wires.update(id, data).catch(e => console.error("Wire save failed:", e));
+    try {
+      await api.wires.update(id, data);
       this._flashSaved();
+    } catch (e) {
+      console.error("Wire save failed:", e);
+      this._flashError();
+    }
   }
 
   // ── Diagram management ────────────────────────────────────────────────────────
@@ -1338,6 +1360,7 @@ class WiringApp {
   _refreshBundleDropdown(selectedId) {
     const sel = document.getElementById("wire-bundle-select");
     if (!sel) return;
+    this._updatingBundleDropdown = true;
     sel.innerHTML = '<option value="">— none —</option>';
     this._bundles.forEach(b => {
       const opt = document.createElement("option");
@@ -1346,6 +1369,7 @@ class WiringApp {
       if (b.id === selectedId) opt.selected = true;
       sel.appendChild(opt);
     });
+    this._updatingBundleDropdown = false;
   }
 
   _refreshBundleEditPanel(bundleId) {