Aar318's High-Contrast Contextual Outliner

Adds a customizable high-contrast outline around the control that currently has keyboard focus.

**Aar318's High-Contrast Contextual Outliner** Never lose keyboard focus on a busy webpage. Contextual Outliner places a bright, customizable border and optional glow around the input, button, link, menu control, or editable region that currently has keyboard focus. **Key Features** - Works on ordinary webpages, including controls inside supported frames. - Keyboard-focus-only mode avoids visual noise from ordinary mouse clicks. - Custom outline color, thickness, glow strength, corner radius, and line style. - Optional gentle pulse for additional visibility. - Responsive settings panel suitable for desktop and mobile extension surfaces. - Changes apply immediately across open tabs. - Reset defaults and a built-in focus preview. - Ko-fi and donation links are clearly separated from extension functionality. **Privacy & Permissions** - `storage` remembers appearance choices locally. - Website access is used only to apply the focus outline. - The extension does not read, store, or transmit typed text, page content, or browsing history. **New Features (v1.0.0.1)** - Fixed the install-time `contextMenus.create(...).catch is not a function` background error by using the correct callback/return-value behavior for Chrome and Firefox. - Serialized toolbar-menu rebuilding and each individual Chrome menu callback so installation, startup, and setting changes cannot race, omit Donate, or create duplicate IDs. - Standardized Ko-fi and Donate in the first menu section above a separator and Outliner actions.