Layout reorganisation from user's diagram:
- Copy + Save move out of the topbar into the toolbar as their own
right-anchored tgroup (margin-left:auto). On wide sidebars they sit at
the end of the drawing-tool row; when the sidebar is narrow, the
actions cluster wraps as its own row on the right instead of nudging
the drawing tools around. Toolbar switches from justify-content:center
to flex-start so the leading tool groups pack left and the actions
group can find the right edge cleanly.
- Topbar right cluster is now Discard / Sound / Maximize / Close — Copy
and Save are gone from the topbar entirely so the right edge reads
as controls-only, not action-mixed.
- Discard button (X icon, danger red on hover) throws away the current
capture — silentmode.invoke("clearRecent", {name}) removes it from the
ring and unlinks the scratch file — then navigates back to the panel.
Distinct from Back, which is non-destructive.
- Close button already existed from 0.6.1 but stays in the same
right-edge position for continuity.
Bundled but not shipped separately — parent session signs and pushes.
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