Filters + history

[respinos]

Implements more of the filter functionality:

• creates a slug for input names and ids to resolve ARC errors
• wires the "clear all" button
• sets the Format and Availability panels to open
• sets any panel that has active items to open after a search

Adds history/context support:

• updates the results heading
• updates the history with text and filters
• initializes the app based on incoming URL parameters

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