Unbreak Docker build: switch to @tailwindcss/vite + pin vite^7

[elemdos]

Summary

• Swap @tailwindcss/postcss → @tailwindcss/vite so the Tailwind v4 entry never goes through Vite's postcss-import (broken on vite 8).
• Add an overrides block pinning vite to ^7.3.3 and @sveltejs/vite-plugin-svelte to ^6.2.4 so Vite 8's lightningcss-by-default minifier doesn't reject @keyframes inside Svelte scoped CSS.
• Delete the now-unused postcss.config.cjs.

Two vite 8 regressions break docker compose build against Dockerfile:

1. vite 8's bundled postcss-import can't resolve bare specifiers, so @import 'tailwindcss'; errors with ENOENT for /app/tailwindcss.
2. vite 8 defaults cssMinify to lightningcss, which rejects @keyframes inside Svelte's scoped CSS selectors.

Originally landed on fix/vite8-tailwind-postcss-import but stayed unmerged; this branch ports the same fix onto current main so the recent dependabot bumps (sveltekit 2.61.1, tiptap 3.24.0, pocketbase 0.27.0, tailwindcss/postcss 4.3.0) are preserved.

Reported by Juri on Discord.

Test plan

• rm -rf node_modules package-lock.json && npm install succeeds
• npx svelte-kit sync && npx vite --config common.config.js build && npx vite --config app.config.js build all succeed locally with vite 7.3.5
• CI Docker build green

Summary by CodeRabbit

• Chores
  • Updated Tailwind CSS build integration to streamline the styling pipeline.
  • Pinned build tool versions for improved consistency and stability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f034c977-d9db-4c76-afe0-b924cb69800c

📥 Commits

Reviewing files that changed from the base of the PR and between 5f7dc57 and 6583a84.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (3)

• app.config.js
• package.json
• postcss.config.cjs

💤 Files with no reviewable changes (1)

• postcss.config.cjs

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📝 Walkthrough

Walkthrough

The PR migrates the Tailwind CSS integration from the PostCSS plugin to Vite by adding the @tailwindcss/vite dependency, importing and registering the Vite plugin in app.config.js, pinning Vite and SvelteKit plugin versions, and removing the PostCSS configuration.

Changes

Tailwind Vite Plugin Integration

Layer / File(s)	Summary
Tailwind Vite dependencies and version constraints package.json	@tailwindcss/vite is added at ^4.3.0; vite and @sveltejs/vite-plugin-svelte are pinned to ^7.3.3 and ^6.2.4 respectively via an overrides block.
Vite configuration with Tailwind plugin app.config.js	The Tailwind CSS Vite plugin is imported and registered in the Vite plugins array alongside the existing SvelteKit plugin.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~7 minutes

Poem

🐰 Tailwind now flows through Vite's swift streams,
No PostCSS config haunts our dreams—
One plugin to bind them all with care,
Build times faster, lighter air! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: switching to @tailwindcss/vite and pinning vite^7 to fix Docker build issues, directly addressing the primary objective.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/docker-build-vite8-on-main

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[elemdos]

Duplicate of #1150 — force-pushed the rebased fix there. Closing this.