fix(calibration-wizard): all-provider discovery + spatial corner picker

- Setup wizard discovery now scans every device provider, not just WLED:
  drop the hardcoded device_type=wled filter so the backend's parallel
  all-provider scan runs (Adalight, DDP, OpenRGB, BLE, DMX, etc). The list
  UI was already multi-type aware (per-type icon + badge).
- Auto-calibration corner picker: finish the unfinished step. The empty
  .autocal-corner-glyph + dead --top-left/etc modifier classes now render a
  mini-screen frame with the matching corner lit, so users map the physical
  lit LED to a button at a glance. Hover/focus lights the corner dot.
- Remove dead empty CSS rule for #wizard-rerun-btn.

server/src/ledgrab/static/css/components.css

@@ -2364,9 +2364,40 @@ textarea:focus-visible {
     background: color-mix(in srgb, var(--primary-color) 18%, var(--card-bg));
 }
 
+/* Spatial corner indicator: a mini "screen" frame with the matching
+   corner lit, so the user maps the physical lit LED to a button at a glance. */
 .autocal-corner-glyph {
-    font-size: 1.4rem;
-    line-height: 1;
+    position: relative;
+    width: 46px;
+    height: 30px;
+    border: 1.5px solid var(--border-color);
+    border-radius: 4px;
+    background: color-mix(in srgb, var(--primary-color) 4%, var(--card-bg));
+    transition: border-color 0.15s, background 0.15s;
+}
+.autocal-corner-glyph::after {
+    content: '';
+    position: absolute;
+    width: 9px;
+    height: 9px;
+    border-radius: 50%;
+    background: var(--border-color);
+    transition: background 0.15s, box-shadow 0.15s;
+}
+.autocal-corner-btn--top-left    .autocal-corner-glyph::after { top: 4px;    left: 4px; }
+.autocal-corner-btn--top-right   .autocal-corner-glyph::after { top: 4px;    right: 4px; }
+.autocal-corner-btn--bottom-left .autocal-corner-glyph::after { bottom: 4px; left: 4px; }
+.autocal-corner-btn--bottom-right .autocal-corner-glyph::after { bottom: 4px; right: 4px; }
+
+/* Light the dot on hover/focus so the active target reads as "this corner". */
+.autocal-corner-btn:hover .autocal-corner-glyph,
+.autocal-corner-btn:focus-visible .autocal-corner-glyph {
+    border-color: var(--primary-color);
+}
+.autocal-corner-btn:hover .autocal-corner-glyph::after,
+.autocal-corner-btn:focus-visible .autocal-corner-glyph::after {
+    background: var(--primary-color);
+    box-shadow: 0 0 7px color-mix(in srgb, var(--primary-color) 75%, transparent);
 }
 
 /* Direction selection grid (1x2) */
@@ -3008,9 +3039,6 @@ textarea:focus-visible {
 }
 @keyframes spin { to { transform: rotate(360deg); } }
 
-/* Toolbar wizard re-run button */
-.header-btn[id="wizard-rerun-btn"] { }
-
 @media (prefers-reduced-motion: reduce) {
     .wizard-progress-fill,
     .wizard-pip,

server/src/ledgrab/static/js/features/setup-wizard.ts

@@ -244,7 +244,9 @@ async function _startDiscovery(): Promise<void> {
     _state.discoveredDevices = [];
     _renderStep();
     try {
-        const data = await apiGet<{ devices?: DiscoveredDevice[] }>('/devices/discover?timeout=3&device_type=wled');
+        // Omit device_type so the backend scans every provider (WLED, Adalight,
+        // DDP, OpenRGB, BLE, …) in parallel — not just WLED.
+        const data = await apiGet<{ devices?: DiscoveredDevice[] }>('/devices/discover?timeout=3');
         _state.discoveredDevices = data.devices || [];
     } catch {
         _state.discoveredDevices = [];