Integrate localized wink guidance into VR calibration

[Elreen]

Summary

Integrates localized left/right wink guidance into the existing Godot VR calibration workflow.

New calibration UI

• apply the locale explicitly supplied by Baballonia
• register all translation resources instead of only English and Spanish
• add gaze-expression and independent left/right wink routines
• show open/closed eye symbols so the requested eye is unambiguous
• include the Lucide eye-icon ISC license

Integration changes required by the extended routine sequence

• reuse one world-fixed instance of the existing reticle/progress-circle UI throughout measurement tests
• restart its existing progress animation for each added test and hide it when training starts
• keep tutorial text separate from measurement progress
• associate timer/video completion callbacks with the routine that created them
• announce packet-handler readiness to the companion Baballonia change
• remove scene placeholder text that could flash while switching through the added routines

The reticle and progress-circle design already existed in the original overlay; this PR adapts its lifecycle so the longer routine sequence preserves the expected presentation.

Companion Baballonia PR

Project-Babble/Baballonia#262

Testing

• exported successfully with Godot 4.6.1 Mono for Windows
• exported PCK and managed overlay assembly hashes verified after embedding
• full OpenVR calibration completed manually
• every transition/countdown, world-fixed reticle, localized text, wink orientation, and training handoff verified