perf: explore bundle optimisations with route-based code splittins

[AFOJ]

Description

Explores (mild) performance optimisations for bundle delivery:

• Route-based code splitting: each page is now lazy-loaded, so the browser only downloads the code for the page being visited instead of one monolithic bundle.
• Vendor chunk splitting: react/react-router (framework), @base-ui/react (ui), and dexie (db) are split into stable named chunks so they stay cached across deploys.

This is intentionally a first pass, further optimisation will be explored later as the app grows to avoid premature optimisation.

Summary by Sourcery

Improve bundle delivery by adding route-based code splitting and cache-friendly vendor chunks.

Enhancements:

• Lazy-load route pages so visitors download only the code required for the page they visit.
• Split framework, UI, and database dependencies into stable vendor chunks to improve caching across deployments.

Build:

• Configure Vite bundle grouping for named vendor chunks.

[sourcery-ai]

Reviewer's Guide

Implements route-based lazy loading for all page components and configures Vite’s build to split vendor code into stable, named chunks for framework, UI, and DB libraries.

Sequence diagram for route-based lazy loading with RouteSuspense

sequenceDiagram
  actor User
  participant Browser
  participant ReactRouter
  participant RouteSuspense
  participant CreateResumePage

  User->>Browser: navigate /resumes/create
  Browser->>ReactRouter: render route element
  ReactRouter->>RouteSuspense: render RouteSuspense
  RouteSuspense-->>User: render fallback spinner
  RouteSuspense->>CreateResumePage: import()
  CreateResumePage-->>RouteSuspense: module loaded
  RouteSuspense-->>User: render CreateResumePage

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File-Level Changes

Change	Details	Files
Introduce route-level lazy loading with Suspense-wrapped page components to enable route-based code splitting.	Replace static imports of page components with React.lazy dynamic imports for each route page. Add a reusable RouteSuspense wrapper component that provides a full-page loading spinner using React.Suspense fallback. Wrap each route element (setup, resumes list/create/upload/view/edit, profile) in RouteSuspense so pages are loaded lazily per route.	src/routes.tsx
Configure Vite/Rolldown to emit stable, named vendor chunks for framework, UI, and DB dependencies.	Add build.rolldownOptions.output.codeSplitting configuration to vite.config to define code splitting groups. Group React, React DOM, React Router, and scheduler into a framework chunk. Group @base-ui/react into a ui chunk, and dexie/dexie-react-hooks into a db chunk so these vendor bundles can be cached across deploys.	vite.config.ts

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