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VNC has no equivalent of RDP's MS-RDPEDISP to request a different resolution from the guest, so a high-resolution remote desktop previously always got shrunk to fit the window, making text illegible. Adds a per-tab "Display Mode" choice (tab-bar right-click) between the existing scale-to-fit behavior and a new actual-size mode that renders the framebuffer at its native pixel size inside a QScrollArea. Reuses VncDisplayWidget's existing scale-to-fit render math unchanged -- it degenerates to an exact 1:1 mapping once the widget is fixed to the remote's own size. Persisted like the terminal theme preference. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>