SDE 1.2.11 — self-update UAT candidate

SDE 1.2.11 — rounded-square icon UAT candidate

Testing prerelease for Windows 11 x64 and Linux Mint Cinnamon amd64.

Uses the owner's supplied skyview_logo_rounded_square.svg for packaged
application icons: a rounded white tile with transparent corners that follows
the desktop background. Preserves the supplied artwork and the existing in-app
logo. This resolves the icon-shape finding from v1.2.10 owner UAT.

The owner reported all v1.2.10 UAT rows Pass on both desktops, then explicitly
requested this icon revision. Themes, zoom and validation guidance are accepted;
#63 and milestone closeout await focused acceptance of the revised icon.

The application/activated maintenance engine is 1.2.11; the development-tool
baseline remains 1.2.1. Installation retains the existing update pause policy,
schedule and user preferences. No theme, zoom or guidance behavior changes.

The native 1.2.10 -> 1.2.11 probe uses unpublished same-source fixtures. Published
v1.2.10 and earlier assets remain unchanged. Owner UAT checks the actual installed
workstation upgrade and native taskbar/dock appearance.

Download all five assets together and authenticate with the trusted installed
pinned verifier before installation. Follow the
installation and focused icon UAT sheet.
Candidate publication is separate from stable promotion and fleet rollout.