Fix Linux simulator launch for AppImage files

[riordant]

:Release Notes:
Fix Linux webOS TV Simulator detection and launch when the simulator executable uses the standard .AppImage extension casing.

:Detailed Notes:
On Linux, webOS TV 26 Simulator is distributed as a file named like:

webOS_TV_26_Simulator_1.5.0.AppImage

The existing simulator discovery checks path.extname(filePath) against .appimage case-sensitively, so .AppImage files are ignored.

Additionally, the launch step reconstructs the executable path using a lowercase .appimage extension, which also fails on case-sensitive Linux filesystems.

This change:

• normalizes the extension check with .toLowerCase()
• records the actual matched simulator executable path
• launches the matched executable path instead of reconstructing one with guessed extension casing

:Testing Performed:

• Installed @webos-tools/cli on Linux using Node 16.
• Downloaded webOS TV 26 Simulator for Linux.
• Confirmed that ares-launch -s 26 -sp <simulator-dir> <app-dir> fails before the patch when the simulator file is named .AppImage.
• Confirmed that simulator detection uses the matched executable path after the patch.

:Issues Addressed:
N/A