Status Chart: Modernize modules, chart.js 4.4.2

[StephanTLavavej]

In addition to weekly updates, and minor dependency updates including chart.js 4.4.2 (no visible changes), this picks up a major update: octokit/graphql.js#549 . Now that @octokit/graphql is ESM (ECMAScript Modules), we need to overhaul how the gather_stats script imports things. For consistency, this also cleans up status_chart, although it was halfway there already.

Back in TypeScript 4.5 (which we picked up in #2348), the extension .mts was introduced, to explicitly indicate that ESM is being used for TypeScript, mirroring the .mjs extension for JavaScript. So I'm renaming our files:

• gather_stats: .ts => .mts, .js => .mjs
• status_chart: .ts => .mts
  • We were already emitting status_chart.mjs for the browser.
• daily_table, weekly_table, monthly_table: .ts => .mts

Finally, we need to update how we consume and resolve modules:

• Use "module": "nodenext" for both gather_stats and status_chart.
  • This implies "moduleResolution": "nodenext".
  • We now need file extensions when importing relative paths.

As usual, this contains a "DROP BEFORE MERGING" commit to make the live preview work, which will accumulate merge conflicts.

📉 Live preview: stephantlavavej.github.io/STL/

⚠️ Note to self:

#4476 updates .github/workflows/update-status-chart.yml in main for these renames.