[AlexAndBear]

Description

A network error while loading a file now shows the network error (e.g. "Network Error") instead of "Cannot read properties of undefined (reading 'status')". Cancelled requests keep their error type again, so they're no longer logged as errors.

Related Issue

• Fixes A network error while loading a file shows a raw JavaScript error #4163

How Has This Been Tested?

• test environment: unit tests (Vitest), browser tests (Playwright) against a local OpenCloud
• test case 1: unit: errors without a response are rethrown as they are, errors with a response are still wrapped
• test case 2: browser: failing content GET, failing PROPFIND, failing MKCOL, 500 and 404 handling, editor and image preview happy path, desktop and Pixel 7

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)