Review follow-ups. An agent preview of an HTML file whose tab the user had switched to Source stayed in Source, so the agent could believe the page was on screen; the preview-tool route and the status-stack row now pass an explicit rendered mode (renderedHtmlTarget), while Files-pane re-opens still keep the user's pick. The pane read the store tab a second time and kept a test-only local mode; it now reads target.renderMode and offers the toggle only on a tab-backed pane. PreviewRenderMode names the mode once; canRenderHtmlFile is the reduced form; a stale load error or annotate draft no longer flashes for a frame on the switch to Source.
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