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The vertical tab rail now reads the owner's tab layout (GET /api/tab-layout) and draws its groups as collapsible sections. This is the first frontend consumer of the tab-layout backend and it is read-only: nothing in the browser writes the layout yet. - tab-layout-browser.js (new, pure, loaded before app.js): projects the layout onto the live sessions and open web tabs, renders the grouped markup, stores collapse per device, and sequences loads newest-wins with a bounded retry on failure. - app.js: loads the layout on init and on tab:layoutChanged, renders the grouped rail from the same per-row markup the flat rail uses, falls through to a full render whenever the grouping structure changes, and withholds drag-reorder in the grouped rail. - Grouping is opt-in by construction. With no layout, a failed read, a layout without groups, or a horizontal strip, the rail renders exactly as before (byte-identical markup). - Grouping is a render layer only: sessionOrder, Alt+N, Ctrl+Tab and the palette keep reading the server-projected order, and row badges keep their Alt+N slot. - A collapsed group still shows the active row; lineage arcs to a hidden session anchor to its group header. - webview-tabs.js: renderWebviewTab() extracted so a single web tab can be placed into its group with unchanged markup.