docs(npm-install): clarify --tag does not override package.json

[MaxBlack-dev]

Description

This PR clarifies that the --tag option for npm install only applies to packages specified on the command line, and does not override version ranges in package.json.

Changes

• Added a note explaining that --tag does not affect dependencies listed in package.json
• Explained that version ranges in package.json take precedence over the --tag flag
• Provided an example showing the correct way to install a tagged version: npm install foo@beta

Context

Users were confused when npm install --tag beta didn't install beta-tagged versions of dependencies listed in package.json. The issue reporter discovered that when package.json specifies a version range like "^0.3.0", the --tag flag is ignored and npm installs a version matching the range, even if the beta tag points to a different version (like 0.4.0-beta.1). This was marked as needing better documentation/logging to make the behavior less surprising.

Closes #4685