Fix web quick-add keyboard viewport bug and shopping-mode add scroll jump

DashboardActivity (the WebView-wrapped web dashboard) had no
windowSoftInputMode override, unlike QuickAddActivity which already sets
adjustResize|stateVisible for the same class of problem: without it,
Android WebViews default to adjustPan, which shifts the whole page up
behind the keyboard instead of resizing the viewport, pushing a centered
`position: fixed` modal's input out of reach when the keyboard opens.

shopping-mode.html's fixed-bottom quick-add bar called a plain .focus()
on the item-name input right after the item list above it grew by one
row. The browser's default scroll-into-view for that focus call was
computed against the now-taller document and dragged the whole page to
the bottom instead of leaving the always-visible fixed bar alone.
preventScroll: true stops that.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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