Device test: name the browser and its version instead of "Ordinary browser" #2052

Problem

The "Test my device" mode of the verification page (#2047) says "Ordinary browser (computer)" for every browser that is not an app's own. Support cannot tell an out-of-date browser, or a Chromium derivative, from a current Chrome without reading the raw user agent in the copied results.

Plan

• Name the market leaders, with the version; anything else keeps the generic wording.
• Chromium-based browsers first: navigator.userAgentData brands (Google Chrome, Chromium, Microsoft Edge, Opera, Brave, Samsung Internet) and getHighEntropyValues(['fullVersionList']) for the full version. This is what tells Chrome, Chromium and Brave apart; their user agents are identical.
• The user agent as the fallback (Firefox, Safari, iOS, a page without HTTPS).
• Shape: Chrome (v. 129.0.6668.81), Chromium (v. …), Brave / Chromium (v. …), Edge / Chromium (v. …), Opera 103 / Chromium (v. 117.…), Samsung Internet 26 / Chromium (v. …), Firefox (v. 131.0), Safari (v. 17.6), Chrome / WebKit (v. …) on iOS; the major version only where nothing finer is given.
• An app's own browser names the app (Instagram, Facebook, WhatsApp, TikTok, LinkedIn, LINE).
• Only in the device test. FFC.Platform stays brand-free by its own rule: no decision reads the name.

Acceptance criteria

• Each browser above is named as shown, with the full version when fullVersionList answers.
• Brave and Chromium are told apart from Chrome when the brands are available.
• An unknown browser keeps "Ordinary browser".
• The copied results carry the same text.
• Tests over a user-agent corpus and brand lists.