feat(lmstudio): add Vulkan-aware desktop entry for LM Studio

dot_local/private_share/applications/ai.elementlabs.lmstudio.desktop

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+[Desktop Entry]
+# Replaces lmstudio-bin's lmstudio.desktop (hidden by lmstudio.desktop here).
+# The ID matches the window app_id and the scratchpad spawn
+# (`gtk-launch ai.elementlabs.lmstudio` in umbriel/rules.toml and
+# omarchy-toggle-scratch). The session pins Vulkan to RADV; LM Studio's Vulkan
+# backend also gets the NVIDIA ICD so it can run models on the Thunderbolt eGPU.
+# The iGPU stays Vulkan device 0. Keep the env in sync with fish conf.d/10-env.fish.
+Type=Application
+Name=LM Studio
+GenericName=Large Language Model Studio
+Comment=A desktop app for exploring and running large language models locally
+Exec=env VK_DRIVER_FILES=/usr/share/vulkan/icd.d/radeon_icd.json:/usr/share/vulkan/icd.d/nvidia_icd.json MESA_VK_DEVICE_SELECT=1002:1586 lm-studio %U
+Icon=lmstudio-bin
+Categories=Development;ArtificialIntelligence;
+Terminal=false
+StartupNotify=true
+StartupWMClass=ai.elementlabs.lmstudio
+MimeType=text/plain;

dot_local/private_share/applications/lmstudio.desktop

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+[Desktop Entry]
+# Hides lmstudio-bin's entry; ai.elementlabs.lmstudio.desktop replaces it.
+Type=Application
+Name=LM Studio
+Hidden=true