Fullscreen MediaViewer refactor

- Moved media related logic into notedeck instead of the ui crate,
  since they pertain to Images/ImageCache based systems

- Made RenderableMedia owned to make it less of a nightmware
  to work with and the perf should be negligible

- Added a ImageMetadata cache to Images. This is referenced
  whenever we encounter an image so we don't have to
  redo the work all of the time

- Relpaced our ad-hoc, hand(vibe?)-coded panning and zoom logic
  with the Scene widget, which is explicitly designed for
  this use case

- Extracted and detangle fullscreen media rendering from inside of note
  rendering.  We instead let the application decide what action they
  want to perform when note media is clicked on.

- We add an on_view_media action to MediaAction for the application to
  handle. The Columns app uses this toggle a FullscreenMedia app
  option bits whenever we get a MediaAction::ViewMedis(urls).

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_dave/src/lib.rs

@@ -8,8 +8,7 @@ use egui_wgpu::RenderState;
 use enostr::KeypairUnowned;
 use futures::StreamExt;
 use nostrdb::Transaction;
-use notedeck::{AppAction, AppContext};
-use notedeck_ui::jobs::JobsCache;
+use notedeck::{AppAction, AppContext, JobsCache};
 use std::collections::HashMap;
 use std::string::ToString;
 use std::sync::mpsc::{self, Receiver};

crates/notedeck_dave/src/ui/dave.rs

@@ -4,8 +4,10 @@ use crate::{
 };
 use egui::{Align, Key, KeyboardShortcut, Layout, Modifiers};
 use nostrdb::{Ndb, Transaction};
-use notedeck::{tr, Accounts, AppContext, Images, Localization, NoteAction, NoteContext};
-use notedeck_ui::{app_images, icons::search_icon, jobs::JobsCache, NoteOptions, ProfilePic};
+use notedeck::{
+    tr, Accounts, AppContext, Images, JobsCache, Localization, NoteAction, NoteContext,
+};
+use notedeck_ui::{app_images, icons::search_icon, NoteOptions, ProfilePic};
 
 /// DaveUi holds all of the data it needs to render itself
 pub struct DaveUi<'a> {