Fix the ODSP shared tree demo issue

[yunho-microsoft]

Description

The example cannot get correct environment example for local run. Fix it by adding plugin in webpack config. The reason is webpack doesn't load environment variables by default. It only works in Node environment.

[Copilot]

Pull Request Overview

This PR ensures the shared-tree demo can read environment variables locally by injecting them via Webpack and updating related configs and docs.

• Injects process.env variables in webpack.config.cjs using DefinePlugin
• Adds "node" types in tsconfig.json and refines clientProps.ts to cast env vars
• Updates README and .env.template to guide users on environment variable setup

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
examples/service-clients/odsp-client/shared-tree-demo/webpack.config.cjs	Added DefinePlugin entries for SITE_URL, SPE_DRIVE_ID, SPE_CLIENT_ID, SPE_ENTRA_TENANT_ID
examples/service-clients/odsp-client/shared-tree-demo/tsconfig.json	Included "node" in types to support process.env
examples/service-clients/odsp-client/shared-tree-demo/src/clientProps.ts	Removed custom process declaration and added as string casts for env vars
examples/service-clients/odsp-client/shared-tree-demo/README.md	Revised instructions to use environment variables from .env.template
examples/service-clients/odsp-client/shared-tree-demo/.env.template	Renamed DRIVE_ID to SPE_DRIVE_ID for consistency

[Copilot]

[nitpick] Capitalize and clarify 'entra id' to 'Entra Tenant ID' to match the variable SPE_ENTRA_TENANT_ID and maintain consistency.

Suggested change

	1. To kick off the example, update the environment variable by replacing siteUrl, driveId, clientId, entra id with your own. Please check detailed environment variable names in .env.template
	1. To kick off the example, update the environment variable by replacing siteUrl, driveId, clientId, Entra Tenant ID with your own. Please check detailed environment variable names in .env.template

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> fluid-framework-docs-site@0.0.0 ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> fluid-framework-docs-site@0.0.0 serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> fluid-framework-docs-site@0.0.0 check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  210260 links
    1663 destination URLs
    1895 URLs ignored
       0 warnings
       0 errors