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* improvement(files): fit-width previews and chip-chrome viewer controls - PDF and DOCX previews now treat 100% zoom as fit-to-width instead of capping at the page's natural print size, removing the dead gutters in wide panels (pdf.js re-renders the canvas at the target width and DOCX uses CSS zoom, so both stay crisp) - PreviewToolbar page/zoom controls move from 24px ghost Buttons with off-token labels to canonical emcn chips (icon-only Chip pills, text-sm --text-body value labels) - XLSX sheet tabs move from underline-style ghost Buttons to a chip cluster using the active pill state - Audio preview swaps the music emoji for the lucide Music icon on design-system tokens * improvement(files): debounce PDF panel-resize re-rasterisation With fit-to-width every pageWidth change re-rasterises all page canvases, so per-tick updates during a panel-divider drag re-rendered the document continuously. First measurement still applies immediately. * fix(files): don't let a zero-width first measurement consume the immediate resize slot A hidden container reports zero width from the ResizeObserver; treating that as the initial measurement pushed the real first width onto the debounce path and delayed initial render. * improvement(files): module cleanup — dedupe media previews, debounce docx refits - Merge the near-identical AudioPreview/VideoPreview into one MediaPreview (shared fetch/blob-URL/error/loading path; only the player differs) - Debounce docx resize refits the same way the PDF preview debounces width measurements (the initial fit comes from the render path, not the observer) - Document the load-bearing buffer copy in pdf-viewer (pdf.js transfers and detaches the ArrayBuffer it receives)