Apply a few updates:

[seratch]

• migrate to next 16
• minor code and setting file improvements
• AGENTS.md
• GitHub Actions job to run lint and build

[Copilot]

Pull request overview

This PR upgrades the project to Next.js 16 and introduces CI automation. The changes streamline ESLint configuration, remove unnecessary code comments, add repository documentation for AI agents, and establish automated lint and build checks via GitHub Actions.

• Upgraded Next.js from v15 to v16 along with corresponding eslint-config-next
• Simplified ESLint configuration and removed obsolete eslint-disable comments
• Added AGENTS.md documentation and GitHub Actions CI workflow

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Updated Next.js and eslint-config-next to v16, changed lint script to use eslint directly
eslint.config.mjs	Simplified ESLint config by importing next config directly instead of using FlatCompat
src/lib/copyText.ts	Removed unused error variables in catch blocks
AGENTS.md	Added repository guidelines for AI agents covering structure, development, and conventions
.github/workflows/ci.yml	Added CI workflow to run lint and build on push/PR to main branch

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