URL normalization: strip tracking params (utm_*, fbclid, etc.) as configurable setting

[paperhurts]

Where

packages/core/src/url.ts (normalizeUrl).

What

Spec §"Open questions" calls this out:

Bookmark URL normalization edge cases. Query string handling: ?utm_source=... parameters. Strip tracking params on save? Configurable list? Default off, add a "clean URL" toggle in settings.

Currently normalizeUrl only strips trailing slashes and non-hashbang fragments. Tracking params propagate.

Proposed shape

1. Add stripTrackingParams: boolean to settings (default false, opt-in).
2. When enabled, normalize strips: utm_*, fbclid, gclid, msclkid, ref, ref_src, plus a small editable allowlist.
3. The list lives in @gitmarks/core so all clients (extension, web UI) share it.

Caveats

Make the list configurable per-user — some sites use utm_* legitimately for non-tracking purposes (rare but real). Probably an advanced settings panel in the web UI, not the extension.

Tracked from

spec.md §"Open questions".