Add selectable ESP-NOW send path for accel/tap input.

Expose best_effort/fast/wait/reliable via UART, dashboard, and CLI so
loss vs latency can be compared under real multi-pod load.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/webui/index.html

@@ -553,6 +553,8 @@
             <strong>Live-Stream</strong>: UART ≈ <code>CACHE_STATUS</code>-Poll (~16&nbsp;ms); BLE ≈
             <code>BLE_STREAM_TICK</code>-Push. Pro Slave <strong>Accel</strong> aktiviert den ESP-NOW-Stream;
             Tap-Notify (S/D/T) steuert die Tap-Arten auf dem Slave.
+            <strong>Input-Send</strong> wählt den ESP-NOW-TX-Pfad für Accel/Tap auf den Slaves
+            (<code>best_effort</code> Default; <code>wait</code>/<code>reliable</code> blockieren länger).
           </p>
           <div class="px-3 pb-2 d-flex flex-wrap gap-2 align-items-center">
             <button type="button"
@@ -564,6 +566,28 @@
             <span class="text-muted small font-monospace" x-show="isBLEHost() && state.live_stream"
                   x-text="bleTickLabel()"
                   title="Median Δt zwischen BLE_STREAM_TICK (esp_timestamp_us)"></span>
+            <label class="text-muted small mb-0" for="input-send-mode">Input-Send:</label>
+            <select id="input-send-mode" class="form-select form-select-sm"
+                    style="width: auto; min-width: 9rem;"
+                    x-model.number="inputSendMode"
+                    :disabled="busy || !hostUp() || !(state.clients || []).length">
+              <option :value="0">best_effort</option>
+              <option :value="1">fast</option>
+              <option :value="2">wait</option>
+              <option :value="3">reliable</option>
+            </select>
+            <button type="button" class="btn btn-outline-secondary btn-sm"
+                    @click="setInputSendMode(inputSendMode)"
+                    :disabled="busy || !hostUp() || !(state.clients || []).length"
+                    title="Modus an alle registrierten Slaves pushen">
+              Setzen
+            </button>
+            <button type="button" class="btn btn-outline-secondary btn-sm"
+                    @click="readInputSendMode()"
+                    :disabled="busy || !hostUp()"
+                    title="Zuletzt gesetzten Modus vom Master lesen">
+              Lesen
+            </button>
             <span class="text-muted small">Tap alle Slaves:</span>
             <label class="tap-toggle"><input type="checkbox" x-model="allTapSingle" :disabled="busy"> S</label>
             <label class="tap-toggle"><input type="checkbox" x-model="allTapDouble" :disabled="busy"> D</label>
@@ -913,6 +937,7 @@
         masterDz: 100,
         masterDzSeeded: false,
         masterLogLevel: 0,
+        inputSendMode: 0,
         masterTapCfg: {
           tap_sens_thres: 5,
           max_gest_dur: 100,
@@ -1796,6 +1821,52 @@
             this.busy = false;
           }
         },
+        formatInputSendMode(mode) {
+          const labels = ['best_effort', 'fast', 'wait', 'reliable'];
+          if (mode == null || mode < 0 || mode > 3) return '—';
+          return labels[mode];
+        },
+        async readInputSendMode() {
+          this.busy = true;
+          try {
+            const r = await fetch('/api/input-send-mode');
+            const data = await r.json();
+            if (!r.ok || !data.success) {
+              this.flash(data.error || 'Input-Send lesen fehlgeschlagen', false);
+              return;
+            }
+            this.inputSendMode = data.mode ?? 0;
+            this.flash(`Input-Send: ${data.mode_name || this.formatInputSendMode(data.mode)}`, true);
+          } catch (e) {
+            this.flash(String(e), false);
+          } finally {
+            this.busy = false;
+          }
+        },
+        async setInputSendMode(mode) {
+          this.busy = true;
+          try {
+            const r = await fetch('/api/input-send-mode', {
+              method: 'PUT',
+              headers: { 'Content-Type': 'application/json' },
+              body: JSON.stringify({ mode, all_clients: true })
+            });
+            const data = await r.json();
+            if (!r.ok || !data.success) {
+              this.flash(data.error || 'Input-Send setzen fehlgeschlagen', false);
+              return;
+            }
+            this.inputSendMode = data.mode ?? mode;
+            this.flash(
+              `Input-Send ${data.mode_name || this.formatInputSendMode(data.mode)} → ${data.slaves_updated || 0} Slaves`,
+              true
+            );
+          } catch (e) {
+            this.flash(String(e), false);
+          } finally {
+            this.busy = false;
+          }
+        },
         patchClientAccelStream(clientId, enabled) {
           const clients = (this.state.clients || []).map((c) => {
             if (c.id !== clientId) return c;