feat: Enhance audio capture and monitoring features

- Added "audioCapture" permission to manifest for microphone access.
- Introduced DeepSeek as a new AI provider option in the side panel.
- Implemented a capture mode selection (tab-only, mic-only, mixed) in the side panel.
- Added options to enable/disable the extension and auto-open the assistant window.
- Integrated a mic monitor feature with live input level visualization.
- Included buttons for requesting microphone permission and granting tab access.
- Updated styles for new sections and mic level visualization.
- Enhanced model fetching logic to support DeepSeek and improved error handling.

style.css

@@ -37,17 +37,27 @@ input[type="password"], select {
     background-color: white;
 }
 
-.ai-provider-section, .model-selection, .api-key-section {
+.ai-provider-section, .model-selection, .api-key-section, .capture-mode-section, .performance-section, .overlay-visibility-section, .mic-monitor-section, .active-state-section {
     margin-bottom: 20px;
 }
 
-.ai-provider-section label, .model-selection label {
+.ai-provider-section label, .model-selection label, .capture-mode-section label {
     display: block;
     margin-bottom: 5px;
     font-weight: 600;
     color: #2c3e50;
 }
 
+.performance-section label,
+.overlay-visibility-section label,
+.active-state-section label {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    font-weight: 600;
+    color: #2c3e50;
+}
+
 .status-message {
     font-size: 12px;
     margin-top: 5px;
@@ -74,6 +84,35 @@ input[type="password"], select {
     background-color: #f8fafc;
 }
 
+.mic-monitor-section {
+    border: 1px solid #e0e6ed;
+    border-radius: 6px;
+    padding: 15px;
+    background-color: #f8fafc;
+}
+
+.mic-monitor-section h4 {
+    margin: 0 0 12px 0;
+    color: #2c3e50;
+    font-size: 16px;
+}
+
+.mic-level {
+    height: 8px;
+    width: 100%;
+    border-radius: 999px;
+    background-color: #e8eef5;
+    overflow: hidden;
+    margin: 6px 0 12px 0;
+}
+
+.mic-level-bar {
+    height: 100%;
+    width: 0%;
+    background: linear-gradient(90deg, #2ecc71, #1abc9c);
+    transition: width 80ms linear;
+}
+
 .context-section h4, .device-section h4 {
     margin: 0 0 15px 0;
     color: #2c3e50;
@@ -296,4 +335,4 @@ button:disabled {
 
 button:disabled:hover {
     background-color: #95a5a6;
-}
+}