docs(todo): break the waybar network module into implementation phases

The network spec is Ready, so I decomposed it into one parent task with Phase 1-5 children (indicator + console recovery, panel + connection management, diagnostics + speed test, docs + rollout, VPN vNext), each naming its deliverable, tests, and verification.

I consolidated the two source tasks into that parent: the wifi-no-internet task is cancelled (folded in, now Phase 1 + Phase 3), and the network-manager task became the parent. I seeded the Phase 1 live checks under Manual testing and validation, since the live network and visual states need real conditions.

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