perf: web dashboard period prefetch + menubar serve client - #959
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Two more surfaces adopt the resident-serve pattern the desktop app got: - Web dashboard: every period tab is prefetched sequentially right after startup, so the first click on 7d/30d/Month answers from the payload cache instead of paying a full parse; stale-while-revalidate rebuilds behind a served payload past 75% of the TTL so expiry never lands its multi-second parse on a user's click. Lifetime prefetches last. - Menubar: ServeConnection (Swift actor) holds one codeburn serve --stdio child; status payload fetches route through it once warm, with the same contract as the app client — cold start and every failure keep the spawn path, three child deaths disable serve for the run, requests time out by killing the child, app termination shuts it down, and a pre-serve CLI (0.9.19) simply dies into permanent spawn fallback, so mixed-version installs degrade gracefully. swift build clean, swift test 156/156, CLI tsc clean; verified live with both the Electron app's and the menubar's serve children resident and answering.
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Completes the resident-serve adoption across surfaces after the desktop app (#956/#957): the web dashboard prefetches every period tab at startup and revalidates stale payloads behind the serve instead of on the click; the macOS menubar holds its own codeburn serve --stdio child through a new ServeConnection actor with the same warm-only routing, spawn fallback, death budget, and shutdown semantics as the app client. A 0.9.19 CLI has no serve command, so mixed-version installs degrade to today's spawn behavior automatically.
swift test 156/156, tsc clean both sides, verified live: both the app's and the menubar's serve children resident and answering on this machine.