Add Dia browser support for URL-based mode triggers

[2R-2T]

Problem

URL-based mode triggers (Email, AI, Messaging…) don't work in Dia, while they work fine in Chrome, Safari, Arc and the other supported browsers.

The Email trigger matches either on an app bundle identifier or on the current page URL (TriggerTemplateCatalog.swift). For the URL path, ActiveWindowService only queries the frontmost app for its URL when that app matches a known BrowserType:

guard let browserType = BrowserType.allCases.first(where: { $0.bundleIdentifier == bundleIdentifier }) else {
    return Task {}
}

Dia wasn't part of the BrowserType enum, so this guard returned early and the URL was never read — no website trigger could ever match while browsing in Dia.

Fix

• Add a .dia case to BrowserType with bundle identifier company.thebrowser.dia.
• Add VoiceInk/Resources/diaURL.scpt.

Dia ships a scripting definition (Dia.app/Contents/Resources/Dia.sdef) exposing an active tab property on window and a URL property on tab, so the script mirrors the existing Arc one:

tell application "Dia"
    tell front window
        tell active tab
            return URL
        end tell
    end tell
end tell

Testing

• Verified the AppleScript returns the active tab URL on Dia (build 2026-07, company.thebrowser.dia).
• xcodebuild -scheme VoiceInk build succeeds, and diaURL.scpt is picked up by the synchronized resources group and copied into VoiceInk.app/Contents/Resources/.
• Confirmed a website trigger (e.g. mail.google.com) now activates the corresponding mode while browsing in Dia.

Note: as with every other browser, macOS will prompt for Automation permission for Dia the first time the script runs.

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Summary by cubic

Enable URL-based mode triggers in Dia so Email/AI/Messaging modes activate while browsing. Adds Dia to BrowserType (bundle id company.thebrowser.dia) and ships diaURL.scpt to read the active tab URL.

^{Written for commit bb1b294. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}