Issue 44/clover v3

[charlesLoder]

Closes #44

• updates Clover-IIIF to v3
• updates React to v19
• removes content editable dep
• creates PromptInput component using a native textarea
• small updates to Figure and Input styling

[Copilot]

Pull Request Overview

This PR modernizes the codebase by migrating from a content-editable-based textarea to a native HTML textarea for prompt input, updating dependencies including React to v19 and Clover-IIIF to v3.

• Replaces the Textarea component (using react-basic-contenteditable) with a new PromptInput component using native <textarea>
• Updates React peer and dev dependencies to support v18.2+ or v19+
• Updates Clover-IIIF from v2.19.2 to v3.0.0

Reviewed Changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
stories/components/TextArea.stories.ts	Removes old Textarea component stories
stories/components/PromptInput.stories.ts	Adds new PromptInput component stories
src/plugin/Panel/index.test.tsx	Updates test mock to use PromptInput instead of Textarea
src/plugin/Panel/ChatInput/index.tsx	Replaces Textarea with PromptInput and updates event handling
src/components/index.ts	Exports PromptInput instead of Textarea
src/components/TextArea/style.module.css	Removes old Textarea styles
src/components/TextArea/index.tsx	Removes old Textarea component
src/components/PromptInput/style.module.css	Adds PromptInput styles using native textarea
src/components/PromptInput/index.tsx	Implements new PromptInput component
src/components/Input/style.module.css	Standardizes border width and adds aria-invalid support
src/components/Figure/style.module.css	Adds min-content width for images
package.json	Updates React, React DOM, and Clover-IIIF versions

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