Hey! Thanks for the incredibly thorough writeup and the kind words. 
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“Design” button graying out after an edit. This is a known issue and we already have a bug open for it, so it’s on our radar to fix.
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Browser memory usage. Were you seeing this in the Agents window or the Editor window? It matters because the two manage browser memory differently. In the Agents window, each tab is a full embedded browser view with its own renderer process, and we intentionally keep a warm pool of those views alive. The Editor window doesn’t keep that pool (it frees a view when you close the tab), so if you saw the 12 GB there, that points more toward a leak than expected behavior. Either way it’s useful data!
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Database deletion / backups. Glad the damage was contained! One thing worth trying if you haven’t: Auto-review run mode. It’s the default now on new installs, and instead of full YOLO, it lets the agent run while also running a classifier against commands, surfacing spicier ones for approval. Worth a look!