perf(gui): faster page data with SWR seeds and less remount churn

[Wibias]

Summary

• Usage: cache by (range, surface) so held tabs paint instantly (quiet revalidate)
• Codex Auth: progressive /accounts paint + in-memory last-good
• Storage / API Keys / Grok / Subagents / Claude: session seeds + soft refresh; Claude Code+Desktop stay mounted
• Logs/Debug: keep Debug mounted after first open; stream-identity gate cuts switch refetch storms

Before/after: devlog/gui-load-perf-pages-before-after.md (baseline usage cold ~5.2s, accounts ~1.2s).

Test plan

• Usage: switch surfaces without full ~5s refetch when data already held
• Codex Auth: accounts appear progressively; revisit uses last-good
• Storage / API Keys / Grok / Subagents: faster second open
• Claude: Code+Desktop tabs don't remount each switch
• Logs ↔ Debug: toggling switches doesn't storm refetches
• gui lint + focused GUI tests

Part of GUI loading split (PERF-2). Companions: #633 (PERF-1), #607 #630 #629 (UI).

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