Security: Mitigate tauri-utils advisory chain (urlpattern/unic/fxhash)

[saagar210]

Tracking unmaintained advisory chain through tauri-utils and related parser crates.

Advisories in this track:

• RUSTSEC-2025-0057 (fxhash)
• RUSTSEC-2025-0075
• RUSTSEC-2025-0080
• RUSTSEC-2025-0081
• RUSTSEC-2025-0098
• RUSTSEC-2025-0100

Current dependency chain evidence:

• tauri-utils -> kuchikiki/selectors -> fxhash
• tauri-utils -> urlpattern -> unic* crates

Planned mitigation path:

1. Track tauri-utils upstream for replacement/removal of affected crates.
2. Validate whether optional features can be pruned without functional regression.
3. Remove waivers as upstream patches become available.

Parent issue: #11