Rename mobile README showcase asset

Rename the mobile companion showcase files to ensure GitHub renders the updated background asset.

README.md

@@ -102,7 +102,7 @@ yay -S stably-orca-git
 Control your agents from your phone.
 
 <p align="center">
-  <picture><source srcset="docs/assets/feature-wall/mobile-companion-showcase.gif" type="image/gif"><img src="docs/assets/feature-wall/mobile-companion-showcase.jpg" alt="Orca desktop with the mobile companion app" width="720" /></picture>
+  <picture><source srcset="docs/assets/feature-wall/mobile-companion-app-showcase.gif" type="image/gif"><img src="docs/assets/feature-wall/mobile-companion-app-showcase.jpg" alt="Orca desktop with the mobile companion app" width="720" /></picture>
 </p>
 
 - **iOS:** [Download from App Store](https://apps.apple.com/us/app/orca-ide/id6766130217)

docs/README.es.md

@@ -102,7 +102,7 @@ yay -S stably-orca-git
 Controla tus agentes desde el teléfono.
 
 <p align="center">
-  <picture><source srcset="assets/feature-wall/mobile-companion-showcase.gif" type="image/gif"><img src="assets/feature-wall/mobile-companion-showcase.jpg" alt="Orca de escritorio con la app companion móvil" width="720" /></picture>
+  <picture><source srcset="assets/feature-wall/mobile-companion-app-showcase.gif" type="image/gif"><img src="assets/feature-wall/mobile-companion-app-showcase.jpg" alt="Orca de escritorio con la app companion móvil" width="720" /></picture>
 </p>
 
 - **iOS:** [Descargar desde App Store](https://apps.apple.com/us/app/orca-ide/id6766130217)

docs/README.ja.md

@@ -102,7 +102,7 @@ yay -S stably-orca-git
 スマートフォンからエージェントを操作できます。
 
 <p align="center">
-  <picture><source srcset="assets/feature-wall/mobile-companion-showcase.gif" type="image/gif"><img src="assets/feature-wall/mobile-companion-showcase.jpg" alt="Orca デスクトップとモバイル companion アプリ" width="720" /></picture>
+  <picture><source srcset="assets/feature-wall/mobile-companion-app-showcase.gif" type="image/gif"><img src="assets/feature-wall/mobile-companion-app-showcase.jpg" alt="Orca デスクトップとモバイル companion アプリ" width="720" /></picture>
 </p>
 
 - **iOS:** [App Store からダウンロード](https://apps.apple.com/us/app/orca-ide/id6766130217)

docs/README.zh-CN.md

@@ -102,7 +102,7 @@ yay -S stably-orca-git
 用手机控制你的智能体。
 
 <p align="center">
-  <picture><source srcset="assets/feature-wall/mobile-companion-showcase.gif" type="image/gif"><img src="assets/feature-wall/mobile-companion-showcase.jpg" alt="Orca 桌面端与移动 companion 应用" width="720" /></picture>
+  <picture><source srcset="assets/feature-wall/mobile-companion-app-showcase.gif" type="image/gif"><img src="assets/feature-wall/mobile-companion-app-showcase.jpg" alt="Orca 桌面端与移动 companion 应用" width="720" /></picture>
 </p>
 
 - **iOS:** [从 App Store 下载](https://apps.apple.com/us/app/orca-ide/id6766130217)