Bump TerminalGuiVersion to 2.4.14-beta.1 (needs fixes)

[tig]

Automated bump of TerminalGuiVersion from 2.4.14-develop.2 to 2.4.14-beta.1 failed validation (build or tests).

Editor needs source changes to absorb this Terminal.Gui update. See the
failed workflow run.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Make the Terminal.Gui bump buildable

With this default pin, the repo no longer builds under the validation path because Directory.Build.props:8 treats warnings as errors and Terminal.Gui 2.4.14-beta.1 marks the configuration APIs used here as obsolete; the failed bump workflow reports errors for SettingsScope/ConfigurationPropertyAttribute usages such as src/Terminal.Gui.Editor/Editor.Commands.cs:24 and the examples/ted/EditorSettings.cs properties. Since CI and normal restores use this default TerminalGuiVersion, the dependency bump needs the accompanying source/configuration migration or suppression before landing.

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[tig]

Superseded by #264 (merged): develop is now migrated to Terminal.Gui's MEC config path and pinned to stable 2.4.15, which resolves the CS0618 build break these auto-bump PRs hit. Closing and deleting the branch.