mobile friendly pdf redaction

[bikubi]

At the moment this contains pdfupload-fixes; I will rebase as soon as that lands.

• pinch-zoom libraries evaluation
  • https://github.com/coddicat/vue-pinch-scroll-zoom
    • made a MWE, half worked
    • requires content and containr sizes provided in absolute pixels responsive sizes only via workaround
  • https://github.com/anvaka/panzoom
    • half implemented, worked
    • seems alive, but old (not a real module...)
    • rather big
    • no pan-while-pinch-zooming
  • https://github.com/drozhzhin-n-e/vue-pinch-zoom
    • didnt try, last commit 4y ago
  • https://github.com/GoogleChromeLabs/pinch-zoom
    • felt awkward, didnt pursue further
  • https://github.com/manuelstofer/pinchzoom
    • many stars
    • lightweight, smol
    • but is looking for a maintainer
    • old, doesnt use PointerEvents
  • settled on https://github.com/timmywil/panzoom
    • lightweight, tiny
    • uses modern PointerEvents
    • supports pan-while-pinch-zooming
    • works ootb with mouse
• optionally considered: on mobile, pan two-fingers only, one finger = auto paint + get rid of tool toggle ⇒ abandoned, because code was behaving weirdly
• I've added maps style zoom buttons
• added "hi dpi render scale"
  • PDF previews were bitmap rendered at device resulution, became very pixelated at even low zoom
  • currently set a 2x, but could depend on display size (but probably something smarted, capped at, like 2k)

note the tool toggle on the left and the zoom ui:

last minute TODO: the tooltip I've added to the tool toggles doesn't respect data-bs-placement (I don't know why), so I might just disable the tooltip on mobile, where it can block the other button, and is generally in the way.

• placement does work, it just flips to right for the long titles
• I've implemented a way to auto-hide the tooltips after a timeout (set to 3s), after focusin events - this won't affect mouse users, but mobile touchers and (unfortunately) keyboard users. A cleaner fix would send adequate events from panzoom to focusout the tooltips...