Fix rtl_433 bias-t flag and add TSCM enhancements

- Fix bias-t option in rtl_433 for RTL-SDR and HackRF:
  - rtl_433's -T flag is for timeout, not bias-t
  - RTL-SDR: Use :biast=1 suffix on device string
  - HackRF: Use bias_t=1 in SoapySDR device string
- Add "Listen (FM/AM)" buttons to TSCM RF signal details
  - Switches to Listening Post mode and tunes to frequency
- Fix device detail header padding to prevent protocol badge
  overlapping with close button

templates/index.html

@@ -2100,6 +2100,21 @@
                         padding: 4px 8px;
                         border-radius: 3px;
                     }
+                    .tscm-action-btn {
+                        padding: 10px 16px;
+                        background: var(--accent-green);
+                        border: none;
+                        border-radius: 4px;
+                        color: #000;
+                        font-size: 12px;
+                        font-weight: 600;
+                        cursor: pointer;
+                        transition: all 0.2s;
+                    }
+                    .tscm-action-btn:hover {
+                        background: #2ecc71;
+                        transform: translateY(-1px);
+                    }
                     .tscm-device-reasons {
                         font-size: 10px;
                         color: var(--text-secondary);
@@ -2296,6 +2311,7 @@
                     }
                     .device-detail-header {
                         padding: 16px;
+                        padding-right: 52px; /* Reserve space for close button */
                         border-bottom: 1px solid var(--border-color);
                         display: flex;
                         justify-content: space-between;
@@ -10665,6 +10681,27 @@
             }
             html += `</table></div>`;
 
+            // Add "Listen" button for RF signals
+            if (protocol === 'rf' && device.frequency) {
+                const freq = device.frequency;
+                html += `
+                    <div class="device-detail-section" style="border-bottom: none;">
+                        <h4>Actions</h4>
+                        <div style="display: flex; gap: 8px; flex-wrap: wrap;">
+                            <button class="tscm-action-btn" onclick="listenToRfSignal(${freq}, 'fm')">
+                                🎧 Listen (FM)
+                            </button>
+                            <button class="tscm-action-btn" onclick="listenToRfSignal(${freq}, 'am')">
+                                🎧 Listen (AM)
+                            </button>
+                        </div>
+                        <div style="font-size: 10px; color: var(--text-secondary); margin-top: 8px;">
+                            Opens Listening Post and tunes to this frequency
+                        </div>
+                    </div>
+                `;
+            }
+
             // Add indicators section
             if (device.indicators && device.indicators.length > 0) {
                 html += `
@@ -10710,6 +10747,28 @@
             document.getElementById('tscmDeviceModal').style.display = 'none';
         }
 
+        function listenToRfSignal(frequency, modulation) {
+            // Close the modal
+            closeTscmDeviceModal();
+
+            // Switch to listening post mode
+            switchMode('listening');
+
+            // Wait a moment for the mode to switch, then tune to the frequency
+            setTimeout(() => {
+                if (typeof tuneToFrequency === 'function') {
+                    tuneToFrequency(frequency, modulation);
+                } else {
+                    // Fallback: manually update the frequency input
+                    const freqInput = document.getElementById('radioScanStart');
+                    if (freqInput) {
+                        freqInput.value = frequency.toFixed(1);
+                    }
+                    alert(`Tune to ${frequency.toFixed(3)} MHz (${modulation.toUpperCase()}) to listen`);
+                }
+            }, 300);
+        }
+
         function showDevicesByCategory(category) {
             const modal = document.getElementById('tscmDeviceModal');
             const content = document.getElementById('tscmDeviceModalContent');

utils/sdr/hackrf.py

@@ -134,8 +134,14 @@ class HackRFCommandBuilder(CommandBuilder):
         Build rtl_433 command with SoapySDR support for ISM band decoding.
 
         rtl_433 has native SoapySDR support via -d flag.
+
+        Note: rtl_433's -T flag is for timeout, NOT bias-t.
+        For SoapySDR devices, bias-t is passed as a device setting.
         """
+        # Build device string with optional bias-t setting
         device_str = self._build_device_string(device)
+        if bias_t:
+            device_str = f'{device_str},bias_t=1'
 
         cmd = [
             'rtl_433',
@@ -147,9 +153,6 @@ class HackRFCommandBuilder(CommandBuilder):
         if gain is not None and gain > 0:
             cmd.extend(['-g', str(int(gain))])
 
-        if bias_t:
-            cmd.extend(['-T'])
-
         return cmd
 
     def get_capabilities(self) -> SDRCapabilities:

utils/sdr/rtlsdr.py

@@ -129,11 +129,22 @@ class RTLSDRCommandBuilder(CommandBuilder):
         Build rtl_433 command for ISM band sensor decoding.
 
         Outputs JSON for easy parsing. Supports local devices and rtl_tcp connections.
+
+        Note: rtl_433's -T flag is for timeout, NOT bias-t.
+        Bias-t is enabled via the device string suffix :biast=1
         """
         rtl_433_path = get_tool_path('rtl_433') or 'rtl_433'
+
+        # Build device argument with optional bias-t suffix
+        # rtl_433 uses :biast=1 suffix on device string, not -T flag
+        # (-T is timeout in rtl_433)
+        device_arg = self._get_device_arg(device)
+        if bias_t:
+            device_arg = f'{device_arg}:biast=1'
+
         cmd = [
             rtl_433_path,
-            '-d', self._get_device_arg(device),
+            '-d', device_arg,
             '-f', f'{frequency_mhz}M',
             '-F', 'json'
         ]
@@ -144,9 +155,6 @@ class RTLSDRCommandBuilder(CommandBuilder):
         if ppm is not None and ppm != 0:
             cmd.extend(['-p', str(ppm)])
 
-        if bias_t:
-            cmd.extend(['-T'])
-
         return cmd
 
     def get_capabilities(self) -> SDRCapabilities: