macOS fix for tunnel cache

[jigar-f]

This pull request primarily adds and wires up support for clearing the tunnel cache via both Dart FFI bindings and the macOS method handler. It also includes a minor parameter renaming for clarity. The most important changes are outlined below.

Dart FFI Bindings Updates:

• Added new FFI methods to LanternBindings in lantern_generated_bindings.dart for patching and retrieving settings/environment variables, running URL tests, updating config, and specifically for clearing the tunnel cache. These methods provide Dart-side access to native functionality.
• Removed duplicate or misplaced definitions of these FFI methods from the end of the class, consolidating them in a single location for clarity and maintainability.

macOS Method Handler Integration:

• Added a new "clearTunnelCache" case to the Flutter method channel switch in MethodHandler.swift, allowing the Flutter app to invoke this functionality.
• Implemented the clearTunnelCache method in MethodHandler, which calls the native MobileClearTunnelCache function asynchronously and returns the result or handles errors appropriately.

Minor Refactor:

• Renamed parameters in the loadInstalledAppIcon method from appPath/iconPath to appPathC/iconPathC for improved clarity and consistency.

[Copilot]

Pull request overview

Adds macOS MethodChannel support and Dart FFI bindings to trigger a native “clear tunnel cache” operation (plus related settings/env/config helpers), aligning Flutter-side calls with the existing native/mobile APIs.

Changes:

• Wire up a new "clearTunnelCache" Flutter method in macos/Runner/Handlers/MethodHandler.swift that calls MobileClearTunnelCache and returns "ok" or a FlutterError.
• Regenerate/adjust Dart FFI bindings in lantern_generated_bindings.dart to expose clearTunnelCache and related settings/env/config/test functions, and remove duplicate definitions.
• Rename loadInstalledAppIcon parameters (appPath/iconPath → appPathC/iconPathC) for clarity.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
macos/Runner/Handlers/MethodHandler.swift	Adds a new MethodChannel case + handler method to clear tunnel cache via MobileClearTunnelCache.
lib/lantern/lantern_generated_bindings.dart	Exposes new/relocated FFI symbol lookups (including clearTunnelCache) and applies a small parameter rename.

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[atavism]

LGTM!