Manage the device's WiFi, plus a batch of quality-of-life fixes

Device WiFi management

• The device network settings now let you disconnect the current WiFi, view saved networks, and forget ones you no longer use (requires the device to be on the latest version).

Improvements & fixes

• Background typing by the AI no longer blocks the keyboard you're using (Mac).
• Returning to a chat session now lands on the latest message instead of jumping to the top.
• Windows: dragging the floating island no longer drifts, and it stays clickable right after you drop it; desktop automation no longer pops up a black terminal window.
• Fixed downloads from the Preview panel producing 0-byte files.
• Added keyboard long-press support for computer use (with the latest device version).

Privacy hardening

• With an empty watched-apps list, no system notifications are read at all (previously everything was).