Adapt UI for Liquid Glass

[WilliamWang1721]

Summary

• add a lightweight Liquid Glass compatibility layer for macOS 26
• keep upstream's macOS 15.0 deployment target with material/NSVisualEffectView fallbacks
• apply the shared glass styling to the main window, settings sheet, waveform pill, and floating teleprompter surfaces

Validation

• Synced with upstream master at 2c02f3eee2d8eac238c10a20d3d0e4b021465656 (v1.7.1) and the localization fixes in Add English and Simplified Chinese localization #50
• macOS checks passed on head 5fed08a7ff51720659d4039183d09a42a32c8d5c: macOS 15 / Xcode 16.2 and macOS 26 / Xcode 26.0, building arm64 and x86_64 without signing
• Native glassEffect calls remain centralized behind compiler and runtime availability guards
• Localization parity/coverage, resource lint, embedded web JavaScript syntax, and git diff --check pass

The upstream pull-request workflow is waiting for maintainer approval; the linked fork workflow has completed successfully.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add missing localization entry for height label

The new Text("settings.height") label will render the raw key at runtime because settings.height was not added to either en.lproj/Localizable.strings or zh-Hans.lproj/Localizable.strings in this commit. This creates a visible regression in the Settings UI (Dimensions section) for all locales, so the key should be added to the localization tables (or reverted to a literal) to avoid showing settings.height to users.

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