File Viewer v2.2.6

Large spreadsheets, page navigation, and Office interaction were painful in a few very specific ways. This patch fixes them at the renderer or engine boundary.\n\n- Bounds large worksheets and avoids duplicate worksheet XML inflation.\n- Adds complete OFD page navigation and print-safe controls.\n- Keeps PDF page anchors stable across navigation and rotation.\n- Blocks DOCX link navigation without losing readable text.\n- Fixes PPTX connector geometry in the maintained PPTX engine.\n- Ships refreshed offline assets, demos, docs, and all framework packages.\n\nAll 54 npm targets, 17 component repositories, and the full local browser regression matrix were verified for v2.2.6.