fix(web): generate web launcher icons and update branding

[bhavjsh]

Summary

Fixes the web launcher icon and removes default Flutter branding from the PSLab web application.

Changes

• added web launcher icon generation configuration in pubspec.yaml
• generated web favicon and icons using flutter_launcher_icons
• updated web/index.html to replace default Flutter text with PSLab branding
• updated web/manifest.json to replace default Flutter metadata with PSLab information

Summary by Sourcery

Update web app branding and configure cross-platform launcher icon generation.

New Features:

• Enable generation of web launcher icons and favicons via flutter_launcher_icons for web, Windows, macOS, and Linux builds.

Enhancements:

• Align web metadata, titles, and descriptions with PSLab branding in index.html and manifest.json.

[sourcery-ai]

Reviewer's Guide

Adds multi-platform launcher icon generation (including web) and updates web metadata and branding from generic Flutter defaults to PSLab-specific values.

File-Level Changes

Change	Details	Files
Configure flutter_launcher_icons to also generate web and desktop platform icons using the existing app icon asset.	Extend flutter_launcher_icons section with web configuration including generation flag, shared image path, background color, and theme color. Enable Windows icon generation with shared image path and explicit icon size. Enable macOS and Linux icon generation, reusing the same icon asset for both.	pubspec.yaml
Update web HTML metadata and manifest to reflect PSLab branding instead of default Flutter text.	Change meta description and page title to use PSLab name and Pocket Science Lab description. Adjust apple-mobile-web-app-title capitalization to PSLab branding. Ensure flutter_bootstrap.js script tag formatting is consistent and remove extraneous whitespace at end of document. Update web app manifest name, short_name, description, and background_color to PSLab-specific values while keeping existing theme color.	web/index.html web/manifest.json

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[sourcery-ai]

Hey - I've left some high level feedback:

• The change in web/index.html removes indentation from the <script src="flutter_bootstrap.js" async></script> line; consider keeping the indentation consistent with the surrounding HTML for readability.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The change in `web/index.html` removes indentation from the `<script src="flutter_bootstrap.js" async></script>` line; consider keeping the indentation consistent with the surrounding HTML for readability.

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[github-actions]

Build Status

Build successful. APKs to test: https://github.com/fossasia/pslab-app/actions/runs/22975168340/artifacts/5880026566.

Screenshots

Android Screenshots

iPhone Screenshots

iPad Screenshots

[rahul31124]

LGTM!