[rpgmem]

Closes #2060

Problem

• The device test's connection row printed navigator.connection.effectiveType as a network generation, so a desktop on a wired or Wi-Fi network read "Online · 4G". effectiveType is a speed class the browser estimates.
• The physical medium (connection.type) was never read; only Chromium for Android and ChromeOS expose it.
• The screen row called devicePixelRatio a zoom.

Change

The connection row now reads one pair on every device: Online/Speed: <medium> / <speed> (pt_BR "Conectado/Velocidade: …").

Browser	Example
Android, Wi-Fi	Online/Speed: Wi-Fi / Fast (like 4G or better)
Android, mobile data	Online/Speed: Mobile data / Slow (like 3G)
Desktop Chrome / Edge	Online/Speed: Connection type not reported / Fast (like 4G or better)
iOS, Safari on a Mac, Firefox	Online/Speed: Connection type not reported / Connection speed not reported
Data saver on	warning, and the "i" says data saver is on and how to turn it off
Offline	Offline (fail, with the "i")

• Speed classes: 4g reads "Fast (like 4G or better)", because the API caps at 4g and no 5G value exists. 3g, 2g and slow-2g read Slow, Very slow and Very slow (below 2G).
• Nothing reported: the row stays informational (not a warning) and gets an "i" that says iOS, or this browser, does not give these details and that the forms do not need them. set() gained an explain flag for that one case.
• Unknown values are safe: an unmapped value, or a key inherited from Object.prototype, reads as not reported.
• Screen row: says "density" instead of "zoom".

Tests

• Vitest: the row on every medium and speed class, not reported, unmapped and inherited keys, data saver, offline, and the "i" on iOS and on other browsers. A passing row with a speed still draws no "i".
• DeviceCheckTest: now also reads the [key, fallback] maps, so every key the script reads must exist in DeviceCheck::strings().
• Catalogues: recompiled; the catalogue-agreement and source-coverage guards pass.
• Lint: ESLint, PHPCS and PHPStan are clean.

Checklist

• Base is develop; no version bump
• CHANGELOG.md — bullet at the end of Fixed
• Documentation topic — the topic names the connection row without describing its values; unchanged
• Strings in the .pot and .po, catalogues recompiled
• Minified assets rebuilt
• Fast checks run locally

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Generated by Claude Code