Three layered fixes for mobile note scrolling:
1. app.css / App.vue: on mobile, override overflow:hidden on html/body
and overflow:visible on #main-app so content from useResizeContainer
(which sets the note-container height to (n+1)*100vh) propagates to
the document and document.body.scrollTop works again.
2. FluxNote.vue: give each .note an explicit height:100dvh on mobile so
the percentage-based height:100% does not resolve against the
inflated container height set by useResizeContainer.
3. StackedNote / StackedPublicNote: replace overflow-y:hidden with
overflow-y:clip on the section. Unlike hidden, clip does not create a
scroll container, so touch events fall through to the page scroll and
the section never feels "draggable" when content fits within the note.
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