A political conference and discussion platform, in Rust and Dioxus

feat(web/wiki): Read a PDF here by default, and offer it first master

Most of what this wiki carries a PDF for is read on a phone at a meeting, and there the browser's viewer is a fixed page in a scrolling box: pinching at six-point type, no reflow, and the page's own find blind to it. This app's renderer reflows, works with find, keeps the page marks, and is the one that can go on improving. So it is the default and the first of the two offered, and an unreadable stored preference now lands on it rather than on the browser. The browser's viewer stays one tap away and unchanged, for a reader who wants the page exactly as laid out, or wants to print it. A device that already chose the browser keeps that choice. Sections of a screen are not cards either: the folder's lists, the amendments and polls under a policy, a ballot, the member and profile sections, the editor, admin and feedback panels, and the loading skeleton that stands in for content while it arrives. Still cards: the home screen's places, the canvases in the picker, a social post, and the notices (error, not found, redirect), which are one of several or a message rather than a surface. Signed-off-by: Niclas Overby <niclas@overby.me>