docs: fold the fourth spec review into the network module spec

Dispositioned all nine fourth-review findings (8 accept, 1 modify) and wove them into a new "V2 panel UX" section: a single nav target, Saved/Available-now/Wired connection groups, join-from-row instead of an Add page, the supported-auth join matrix, progressive loading, future-tense verified Forget, a findable redacted diagnostics report, and the Waybar visual contract. The modify kept the full speed test under Performance per the prior decision while accepting an inline latency probe stored in the doctor report. Findings cookie now reads complete.

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