Improved structure

[timea-solid]

This is part of the optimization work

[Copilot]

Pull Request Overview

This PR restructures the pane-registry package to move source files into a src/ directory and updates dependencies. The main purpose is to reorganize the package structure for better maintainability and update the build tooling.

• Moved paneRegistry.js and index.d.ts files to src/ directory
• Updated package.json to point to new file locations and added files field
• Updated solid-logic dependency to a pre-release version
• Updated ESLint configuration to target src/ directory with additional rules
• Removed Node.js 18.x from CI workflow

Reviewed Changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/paneRegistry.js	New location for the pane registry implementation (moved from root)
src/index.d.ts	New location for TypeScript definitions (moved from root)
package.json	Updated main/types paths, added files field, updated dependency versions and lint scripts
package-lock.json	Updated lockfile to reflect new dependency versions including pre-release solid-logic and new dev dependencies
eslint.config.mjs	Updated to target src/ directory with additional linting rules
.github/workflows/ci.yml	Removed Node.js 18.x from test matrix

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