test(tooltip): add comprehensive unit tests for GalleryTooltip (Vitest + RTL)

[VetteIT]

Description

Adds a comprehensive unit test suite for the GalleryTooltip component using Vitest + React Testing Library.
Covers default/explicit placement, open state management, hover vs touch interactions, and onOpen/onClose behavior.

Closes #111

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What change does this PR introduce?

• Bug fix
• New feature
• Breaking change
• CI/CD
• Documentation update
• Chore (tests)

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What is the proposed approach?

• Mocked MUI Tooltip to a lightweight function to capture and assert open, placement, disable*, onOpen, onClose.
• Simulated devices via window.matchMedia('(hover: none)') to test touch vs non-touch flows.
• Verified title renders Typography-wrapped content and interactions toggle open as expected.

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Checklist:

• The commit message follows our adopted guidelines
• Testing has been done for the change(s) added
• Relevant comments/docs have been added/updated (N/A — tests only)