fix(privacy-policy): route non http(s) links out of the WebView

[jim-daf]

Closes #164.

PrivacyPolicyActivity.onCreate sets up the WebViewClient with only an onReceivedError override, so any link in the privacy policy with a non http(s) scheme (mailto:, tel:, intent:, market:, geo:, ...) is dispatched by the default WebView handler instead of leaving the WebView for the system app that registered for that scheme. The visible effect is that tapping a mailto: link in the policy text shows nothing.

Change

Override shouldOverrideUrlLoading. Keep http(s) inside the WebView, route other schemes to Intent.ACTION_VIEW, and wrap the launch in try/catch (ActivityNotFoundException) so a device with no handler does not crash the Activity:

override fun shouldOverrideUrlLoading(view: WebView?, request: WebResourceRequest?): Boolean {
    val url = request?.url ?: return false
    val scheme = url.scheme?.lowercase()
    if (scheme == "http" || scheme == "https") return false
    return try {
        val intent = Intent(Intent.ACTION_VIEW, url).apply {
            addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
        }
        startActivity(intent)
        true
    } catch (e: ActivityNotFoundException) {
        false
    }
}

Behaviour

• A normal https://opencloud.eu/privacy link inside the policy keeps loading in the WebView like before.
• A mailto:legal@opencloud.eu link now opens the user's mail app.
• A scheme nothing on the device handles falls through to false so the user does not see a crash.