fix: align linux mpv runtime support checks

apps/electron-backend/native/src/embedded_mpv_wid_common.h

@@ -865,7 +865,8 @@ void refreshLinuxMpvSnapshot(const std::shared_ptr<Session>& session)
         session->snapshot.durationSeconds = std::max(0.0, *duration);
     }
     if (volume) {
-        session->snapshot.volumePercent = clampVolumePercent(*volume);
+        session->snapshot.volumePercent =
+            std::max(0.0, std::min(100.0, *volume));
     }
     if (paused) {
         session->snapshot.status =

apps/electron-backend/src/app/services/embedded-mpv-native-source.spec.ts

@@ -354,6 +354,22 @@ describe('Embedded MPV native source recording invariants', () => {
         );
     });
 
+    it('keeps Linux MPV IPC volume readback in mpv percent units', () => {
+        const refreshBody = sourceFunctionBody(
+            widCommonSource,
+            'void refreshLinuxMpvSnapshot(',
+            'refreshLinuxMpvSnapshot'
+        );
+        expect(refreshBody).toContain(
+            'queryLinuxMpvNumber(socketPath, "volume")'
+        );
+        expect(refreshBody).toContain(
+            'session->snapshot.volumePercent =\n' +
+                '            std::max(0.0, std::min(100.0, *volume));'
+        );
+        expect(refreshBody).not.toContain('clampVolumePercent(*volume)');
+    });
+
     it('keeps Linux MPV snapshot IPC off the NAPI snapshot read path', () => {
         const getSnapshotBody = sourceFunctionBody(
             widCommonSource,

apps/electron-backend/src/app/services/embedded-mpv-native.service.spec.ts

@@ -477,10 +477,6 @@ describe('EmbeddedMpvNativeService power blocker', () => {
             platform: 'win32' as NodeJS.Platform,
             runtimeFile: path.join('lib', 'mpv-2.dll'),
         },
-        {
-            platform: 'linux' as NodeJS.Platform,
-            runtimeFile: path.join('lib', 'libmpv.so.2'),
-        },
     ])(
         'loads the addon after validating the $platform runtime file exists',
         ({ platform, runtimeFile }) => {
@@ -513,6 +509,36 @@ describe('EmbeddedMpvNativeService power blocker', () => {
         }
     );
 
+    it('loads the Linux addon without bundled libmpv runtime files', () => {
+        delete process.env.WAYLAND_DISPLAY;
+        Object.defineProperty(process, 'platform', {
+            value: 'linux',
+        });
+        const nativeDir = createTempDir();
+        const addonPath = path.join(nativeDir, 'embedded_mpv.node');
+        writeFileSync(addonPath, '');
+        const loadAddonModule = jest.fn().mockReturnValue(addon);
+
+        Object.assign(service as unknown as Record<string, unknown>, {
+            addon: null,
+            addonLoadError: null,
+            loadAddonModule,
+            getAddonCandidatePaths: () => [addonPath],
+        });
+
+        expect(service.getSupport()).toEqual(
+            expect.objectContaining({
+                supported: true,
+                platform: 'linux',
+            })
+        );
+        expect(loadAddonModule).toHaveBeenCalledWith(addonPath);
+        expect(mockSpawnSync).toHaveBeenCalledWith('mpv', ['--version'], {
+            stdio: 'ignore',
+            timeout: 3000,
+        });
+    });
+
     it('loads the addon before reporting support capabilities', () => {
         const loadAddonModule = jest.fn().mockReturnValue(addon);
         Object.assign(service as unknown as Record<string, unknown>, {

apps/electron-backend/src/app/services/embedded-mpv-native.service.ts

@@ -944,6 +944,10 @@ export class EmbeddedMpvNativeService {
         const nativeDir = path.dirname(addonPath);
         const runtimeCandidates = this.getRuntimeLibraryCandidates(nativeDir);
 
+        if (runtimeCandidates.length === 0) {
+            return null;
+        }
+
         if (!runtimeCandidates.some((candidate) => existsSync(candidate))) {
             return [
                 'Embedded MPV runtime is incomplete. Missing one of:',
@@ -969,11 +973,7 @@ export class EmbeddedMpvNativeService {
                     path.join(nativeDir, 'mpv.dll'),
                 ];
             case 'linux':
-                return [
-                    path.join(nativeDir, 'lib', 'libmpv.so.2'),
-                    path.join(nativeDir, 'lib', 'libmpv.so.1'),
-                    path.join(nativeDir, 'lib', 'libmpv.so'),
-                ];
+                return [];
             default:
                 return [];
         }