Change port to default 4insight port

[anna-follestad-4ss]

What changed

The default port was set to 5050, 4insight's default port

Why

The previous version used dash's default port.

Definition of done

CI covers the first two. The rest are yours — tick them because you did them,
not because they were already ticked. See CONTRIBUTING.md for why each is here.

• pytest passes
• black is clean
• PORT is introduced as an env variable in .env
• PORT is loaded and passed to app.run
• App is served at localhost:5050 as default.

[Copilot]

Pull request overview

This pull request updates the Dash app startup configuration to use 4insight’s default port (5050) by default, while allowing the port to be configured via an environment variable.

Changes:

• Introduces a PORT environment variable (defaulting to 5050) and passes it into app.run(...).
• Documents the new PORT setting in .env.example.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/app.py	Reads PORT from environment (default 5050) and passes it to app.run.
.env.example	Adds PORT=5050 to the example environment configuration.

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