fix: match Zen browser in Firefox web watcher buckets

[pelevin-d-y]

Summary

• include Zen in the Firefox-compatible browser app regex
• keep the existing dedicated Zen bucket support unchanged
• add a unit test for Zen app names reported with Firefox web watcher buckets

Why

Zen Browser can use the Firefox WebExtension build of aw-watcher-web, which reports URL events into aw-watcher-web-firefox buckets. In that setup the window watcher reports the browser app as Zen, but the Firefox bucket query only accepted Firefox/LibreWolf/Waterfox/Nightly app names, so Browser view dropped those URL events.

Test

• npx jest --selectProjects node test/unit/queries.test.node.ts --runInBand

[greptile-apps]

Greptile Summary

This PR fixes Zen Browser URL events being silently dropped from the Browser view when Zen uses the Firefox WebExtension build of aw-watcher-web. The window watcher reports the app as Zen, but the Firefox bucket query only accepted Firefox/LibreWolf/Waterfox/Nightly app names, so no window events matched and the URL event intersection came up empty.

• Adds zen to the firefox entry of browser_appname_regex in src/queries.ts; the existing dedicated zen browser entry and its own regex pattern are left intact, preserving native Zen bucket support.
• Adds a unit test asserting that 'Zen' and 'Zen Browser' match the updated firefox regex.

Confidence Score: 5/5

A minimal, targeted fix that adds one alternative to an existing regex and a corresponding unit test. No behavioral changes for existing browser types.

The change is a single-token addition to an existing regex alternative group. It is verified by a new test, does not touch query generation logic, and Zen's dedicated bucket path remains unaffected.

No files require special attention.

Important Files Changed

Filename	Overview
src/queries.ts	Adds zen to the Firefox browser_appname_regex alternative so Zen Browser window events match Firefox-bucket URL queries; the existing dedicated zen pattern is left untouched.
test/unit/queries.test.node.ts	Adds a focused regression test verifying the firefox regex matches both 'Zen' and 'Zen Browser'; test is minimal but correct for the documented scenario.

Sequence Diagram

sequenceDiagram
    participant WW as Window Watcher
    participant ZEN as Zen Browser
    participant FB as aw-watcher-web-firefox bucket
    participant Q as queries.ts (browserEvents)

    ZEN->>FB: URL events (via Firefox WebExtension)
    WW->>Q: "window events (app="Zen")"

    Note over Q: browsersWithBuckets finds aw-watcher-web-firefox
    Q->>Q: "events_firefox = flood(query_bucket(firefox_bucket))"
    Q->>Q: "window_firefox = filter_keyvals_regex(events, "app", "(?i)(firefox|...|zen)")"
    Note over Q: "Zen" now matches firefox pattern
    Q->>Q: "events_firefox = filter_period_intersect(url_events, window_firefox)"
    Q-->>Q: Zen URL events correctly attributed

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