Change in html

[HARISHVIJAY006]

change in Front page of the Flutter page and it gets loaded

Summary by Sourcery

Redesign the Flutter web index.html by updating metadata, adding a styled loading screen, and switching to the flutter.js loader for streamlined app initialization

New Features:

• Add custom loading screen with logo, animated spinner, and loading text

Enhancements:

• Update HTML metadata (lang attribute, viewport, description, title, and manifest links)
• Replace manual service worker logic with flutter.js loader entrypoint and streamline app bootstrap
• Simplify base href to root path

[sourcery-ai]

Reviewer's Guide

This PR refactors the Flutter web entrypoint by enriching the HTML head for accessibility and PWA support, introducing a custom loading screen with CSS animations, and replacing the old service‐worker bootstrap script with the official flutter.js loader.

Sequence diagram for new Flutter web bootstrap process

sequenceDiagram
  actor User
  participant Browser
  participant "flutter.js loader"
  participant "Flutter Engine"
  User->>Browser: Load AppFlowy Flutter web page
  Browser->>"flutter.js loader": Load flutter.js
  "flutter.js loader"->>"Flutter Engine": Initialize engine
  "Flutter Engine"-->>"flutter.js loader": Engine initialized
  "flutter.js loader"->>Browser: Remove loading screen
  "flutter.js loader"->>"Flutter Engine": Run app
  "Flutter Engine"->>User: Display Flutter app

Loading

File-Level Changes

Change	Details	Files
Enhanced HTML head metadata and PWA assets	Added lang="en" on tag Set base href to "/" and updated viewport and description meta tags Reordered title, manifest, and apple-touch-icon declarations	frontend/appflowy_flutter/web/index.html
Introduced custom loading screen and styles	Inlined CSS for body layout, spinner, logo fade-in, and text pulse animations Added loading-container HTML with logo, spinner, and loading text	frontend/appflowy_flutter/web/index.html
Replaced manual service worker script with flutter.js bootstrap	Removed legacy service-worker registration and fallback logic Added deferred flutter.js loader and onEntrypointLoaded engine initializer Removed loading screen upon engine initialization and invoked runApp()	frontend/appflowy_flutter/web/index.html

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[HARISHVIJAY006]

This pull request updates the index.html file of the Flutter web app to enhance the loading experience and improve initialization.