build: split the bundle into multiple chunks

[amareshsm]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Fix build warnings:

What changes did you make? (Give an overview)

• add Vite bundle optimisation with vendor/parser/ui chunk splitting for better caching and load time.

Scenario	Before (entire bundle changes)	After (specific chunk only changes)
First Visit	5.8 MB	5.8 MB
Code Update	5.8 MB	263 KB
UI Library Update	5.8 MB	116 KB
Dependency Update	5.8 MB	18 KB

• Safelist Migration
  Before (Tailwind v2 syntax - deprecated)

purge: {
  content: ["./{pages,components,app,src}/**/*.{ts,tsx}"],
  options: {
    safelist: ["cm-editor", "cm-gutter", "ͼ1", "cm-focused"],
  },
},

After (Tailwind v3+ syntax - current)

safelist: ["cm-editor", "cm-gutter", "ͼ1", "cm-focused"],

Related Issues

Is there anything you'd like reviewers to focus on?

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[lumirlumir]

This looks like a nice optimization and works well on my end.

I've left a single comment about an unused class name. Otherwise, everything looks good.

[kecrily]

LGTM, thanks

[lumirlumir]

LGTM, thanks!