feat(input): add macOS Steam Controller compatibility toggle

[zortos293]

This PR adds an experimental macOS-only Input setting that restores Chromium's older HID gamepad path to fix Steam Controller recognition on Electron 42.3.3 (Chromium 135), which broke compatibility by enabling kXboxUseGameControllerDataFetcherMac by default. The setting is opt-in, defaults to off, applies after app restart, and includes a warning about potential Xbox controller compatibility trade-offs.

• Added opennow-stable/src/main/chromiumCommandLine.ts with buildChromiumCommandLine to conditionally append XboxUseGameControllerDataFetcherMac to disable-features on macOS when the setting is enabled.
• Added steamControllerCompatibilityMode to Settings interface in opennow-stable/src/main/settings.ts and opennow-stable/src/shared/gfn.ts, with normalization and migration to ensure boolean type.
• Updated opennow-stable/src/main/index.ts to use the new command-line builder and bootstrap preferences loader on startup.
• Added macOS-only toggle in Input settings in opennow-stable/src/renderer/src/components/SettingsPage.tsx with experimental badge and hint explaining the trade-offs.
• Added English localization strings for the new setting.
• Added unit tests for Chromium command-line building and preference normalization.

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Note

Medium Risk
Changes low-level gamepad discovery via Chromium flags at process start; opt-in and restart-bound, but wrong platform/state could affect Xbox vs Steam Controller behavior.

Overview
Adds an opt-in, macOS-only Input setting Steam Controller Compatibility Mode (default off) that takes effect after restart.

Startup Chromium flags are built through a new buildChromiumCommandLine path: when the toggle is on on darwin, it appends XboxUseGameControllerDataFetcherMac to disable-features so Chromium uses the older HID gamepad path for Steam Controller, with UI copy warning this may hurt Xbox controller compatibility.

The setting is wired through shared types, settings.json defaults/migration, bootstrap preference loading in main, a macOS-only experimental toggle in Input settings (plus search keywords and English strings), and unit tests for normalization and platform-gated feature flags.

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