Update topbar icon to use fonts

[ryanlua]

Use the backpack vector icon from the builder icons font for the icon.

This pull request updates the appearance and configuration of the topbar inventory icon in src/TopbarIcon.client.luau. The main focus is on improving the icon's label, font, and layout for better clarity and consistency.

UI and Label Improvements:

• Replaced the previous image-based icon with a text label ("backpack") and updated the label styling, including font, size, and weight for both selected and deselected states.
• Forced a minimum width for the icon label container to ensure consistent layout.

Configuration Adjustments:

• Set the icon's order, toggle key, and auto-deselect behavior, and restored the "Inventory" caption.

[Copilot]

Pull request overview

This pull request modernizes the topbar inventory icon by replacing image-based rendering with a font-based icon from the BuilderIcons library. The change improves consistency and maintainability by leveraging vector icons instead of static images.

Changes:

• Replaced image-based icon (ICON_SELECTED_IMAGE and ICON_DESELECTED_IMAGE) with font-based "backpack" label using BuilderIcons
• Configured separate font weights (Bold for selected, Regular for deselected) for visual state differentiation
• Added minimum width constraint to ensure consistent icon layout

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