Upgrade Astro project to v7 prereleases

[Copilot]

Summary

Upgrade Astro-related dependencies to the v7 prerelease line and fix build warnings surfaced by the upgrade.

Changes

• bump astro to 7.0.0-beta.3
• bump @astrojs/mdx to 7.0.0-alpha.1
• align @astrojs/check with the Astro v7 prerelease toolchain
• bump all expressive-code / astro-expressive-code packages to 0.43.1 to eliminate Astro markdown deprecation warnings (markdown.remarkPlugins, rehypePlugins, gfm, smartypants)
• refresh bun.lock

Validation

• bun install --frozen-lockfile
• bun --bun run format:check
• bun --bun run lint
• bun --bun run stylelint
• bun --bun run build (blocked in this sandbox by outbound network restrictions while fetching remote content in src/content.config.ts)

Notes

• Parallel validation reported no code review findings.
• CodeQL reported no analyzable code changes for this dependency-only update.
• The Vite resolve.alias customResolver warning originates inside Astro's own vite-plugin-config-alias (triggered by tsconfig.json path aliases); it cannot be suppressed from user-space and requires an upstream Astro fix.

[sebdanielsson]

@copilot Check the build logs and fix the vite warnings too.

[Copilot]

Pull request overview

This PR upgrades the project’s Astro toolchain to the v7 prerelease line, updating core Astro and related integrations and refreshing the Bun lockfile to match the new dependency graph.

Changes:

• Bump astro to 7.0.0-beta.3.
• Bump @astrojs/mdx to 7.0.0-alpha.1.
• Align @astrojs/check to an Astro v7 prerelease version and update bun.lock.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updates Astro-related dependency versions to v7 prereleases.
bun.lock	Refreshes the resolved dependency tree for the new Astro/v7 prerelease toolchain.

[Copilot]

@copilot Check the build logs and fix the vite warnings too.

Addressed in commit fix: upgrade expressive-code packages to 0.43.1 to silence Astro markdown deprecation warnings.

Root causes found:

1. [astro] markdown.remarkPlugins/rehypePlugins/remarkRehype/gfm/smartypants are deprecated warnings — astro-expressive-code@0.43.0 was falling back to the deprecated markdown.rehypePlugins injection path because it didn't yet detect Astro's default Unified processor at config setup time. Fixed by upgrading all expressive-code/astro-expressive-code/rehype-expressive-code/@expressive-code/* packages to 0.43.1, which includes the fix "Avoids Astro 6.4 deprecation warnings by registering Expressive Code with the Unified Markdown processor when available."

2. [WARN] [vite] resolve.alias contains an alias with customResolver option — This originates in Astro's own vite-plugin-config-alias internal plugin, which creates customResolver aliases for every paths entry in tsconfig.json. Eliminating this from user-space would require removing the "@/*": ["src/*"] mapping from tsconfig.json, which would break TypeScript type-checking across the project. This is an upstream Astro v7 beta issue that should be resolved in a future beta once Astro migrates that plugin to the non-deprecated resolveId/enforce: 'pre' approach.