Shield and Cookie Pop-ups are settings more than tools, so their
switches, the cookie mode, the counters and "Update rules" now sit in
Settings › Performance under a Protections heading, driven through the
add-ons' own message handlers (Settings-only IPC). Each card opens the
add-on's panel for the per-site details, and each panel links back to
Settings. The two add-ons start hidden from the toolbar's extension
row (manifest dock:"hidden", honoured once so a user who shows them
keeps them); "Show hidden" on the row brings them back.
theseus://settings and theseus://settings/<section> are now addresses,
so any page or note can link to a Settings page.
Also: a Settings or add-on tab that the user navigates elsewhere stops
counting as that tab, otherwise "open Settings" kept focusing a tab
that no longer showed Settings.
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