"Enable Browser User Scripts Support" `/open-dev` is likely confusing for new users

[lionel-rowe]

From docs/use/open-dev page:

Due to browser restrictions, extensions are forced to upgrade to Manifest V3, and Manifest V2 extensions will be completely discontinued after June 2025;

Under the limitations of Manifest V3, you must enable developer mode/user scripts functionality to use ScriptCat extension normally.

Reference: Developer mode for extension users, Manifest V3

⚠️⚠️⚠️ For browser kernel versions >=138, you need to enable Allow User Scripts. For lower versions <138, use Enable Developer Mode.

⚠️⚠️⚠️ Please note: If you are using Windows 8/7/XP systems, or browser kernel versions lower than <120, you need to manually install the legacy ScriptCat. v0.16.x is the last version that supports Manifest V2. Installation steps can be found at: Load unpacked extension installation.

Starting with multiple paragraphs talking about "Manifest V3" and even "browser kernel versions" is likely to be very confusing for new users, especially if they're non-technical.

I'd suggest a more user-friendly approach would be something like this (pseudocode, with some dynamic conditional content):

<script>
// some javascript to parse user agent and select relevant tabs
// e.g. { vendor: 'chrome', versionNumber: '144.0.0' }
const { vendor, versionNumber } = parseUa()
for (const tabGroup of tabGroups) selectTab(tabGroup, vendor)
// + whatever i18n handling is necessary
globalThis.actionLink = parseInt(versionNumber) >= 138
    ? "[Allow User Scripts](#allow-user-scripts)"
    : "[Enable Developer Mode](#enable-developer-mode)"
</script>

# Enable Browser User Scripts Support

> [!IMPORTANT]
> In order to use ScriptCat, you need to {{ actionLink }}, otherwise the extension will be unable to function.

## Allow User Scripts
<!-- Allow User Scripts section -->

## Enable Developer Mode
<!-- Enable Developer Mode section -->

Better still (but a bit more work to implement) would be having the extension communicate its current allow-user-scripts permission status to https://docs.scriptcat.org/, such that the page could conditionally replace the [!IMPORTANT] message with a Congratulations! User scripts are now enabled message.