v1.7.7 test (compact mode + UI polish)

Test build - new since v1.7.5:\n- Compact summary mode (small cover + badges + Title ID / Version, all copyable, remembers last state)\n- Rounded pill badges + buttons, flat Files/Details chrome\n- About dialog with logo, bigger Links button\n- Linux packages now ship the About logo\n\nWindows: run PKGViewer.exe (portable, no install needed). Linux: sudo apt install PKGViewer-1.7.7.deb or unpack the tarball.