Dynamic websites with filters show as duplicate sources

**Type:** Bug

**Description:**
When using dynamic websites that have filters but don't change the URL, the system incorrectly identifies them as duplicate sources. Additionally, these sources don't work properly with web archive functionality.

**Steps to Reproduce:**
1. Add a source from a dynamic website with filters
2. Apply different filters on the same page
3. Try to add as another source
4. System shows duplicate source warning
5. Web archive feature fails to capture the filtered state

**Expected Behavior:**
- System should recognize different filter states as unique sources
- Web archive should capture the current filtered view