feat: add support for a min collapsed size

[rijkvanzanten]

This allows you to peek some of the content of the collapsed panel when it's collapsed

[Copilot]

Pull Request Overview

This PR adds support for a collapsedSize property that allows panels to maintain some visible content when collapsed, instead of completely hiding the panel. This enables a "peek" functionality where users can see a portion of the collapsed panel.

• Adds collapsedSize prop to define how much of the panel remains visible when collapsed
• Updates grid template logic to use the collapsed size instead of 0 when collapsed
• Modifies collapse behavior to set panel size to the collapsed size value instead of 0

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/vue-split-panel/src/types.ts	Adds collapsedSize property definition with documentation
packages/vue-split-panel/src/composables/use-sizes.ts	Adds collapsedSize parameter and percentage calculation logic
packages/vue-split-panel/src/composables/use-grid-template.ts	Updates grid template to use collapsedSizePercentage instead of hardcoded 0
packages/vue-split-panel/src/composables/use-grid-template.test.ts	Updates tests to verify collapsed size behavior
packages/vue-split-panel/src/composables/use-collapse.ts	Modifies collapse logic to use collapsedSize instead of 0
packages/vue-split-panel/src/composables/use-collapse.test.ts	Adds comprehensive tests for custom collapsed size functionality
packages/vue-split-panel/src/SplitPanel.vue	Integrates collapsedSize prop throughout the component
packages/vue-split-panel/playground/src/App.vue	Demonstrates the new feature with a 50px collapsed size
docs/content/1.getting-started/2.usage.md	Documents the new collapsedSize property

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