1. The preview's right-click handler swallowed every right-click for the zoom box, so the
element/backdrop context menu could not open at all. Sources and capture windows must be
changeable AT ANY TIME — a creator swaps a window mid-stream without entering edit mode.
Ctrl + right-click now bypasses the zoom path and lets WPF open the menu under the cursor;
plain right-click keeps the zoom box. No menu markup changed.
2. The wordmark's "ty" is YouTube red (#ff0000), permanently. The token sweep had recoloured it
to the interactive blue because it was a bare literal; DESIGN.md now records "never re-colour
the wordmark" beside the token, and UiShellTests pins it.
Guard: UiShellTests gains the wordmark rule and the Ctrl+right-click chord.
gramps
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