Release SleepStrap 6.9.3

[SleepyDebug]

Changes

• rename the Pandora sky in the gallery to Zoff while preserving existing selections and embedded assets
• keep Dark textures active at lower Roblox graphics quality by generating complete BC1 mip chains
• simplify screen stretch to one balanced on/off mode with no strength selector
• map recorded macro coordinates into the active Roblox client area to support current monitor layouts
• bump the app and download documentation to 6.9.3

Root causes

• the supplied dark diffuse DDS files only contained their highest-resolution mip
• the RIVALS recording used negative desktop coordinates from a monitor positioned left of the primary display

Validation

• Release x64 build passed with 0 errors for the functional fixes
• staged diff check passed
• GitHub CI rebuilds the exact 6.9.3 release commit