viewer: migrate to vue 3, general refactoring and cleanup

Non-exhaustive list of fixes and improvements done at the same time:

- html default background to grey (avoids white flash during init)
- unified links behavior
- added more theme variables
- removed the flex-expand transition (it wasn't working) and replaced it
  with a slide
- fixed LdLoading not centered on the content
- title on removable tags
- fixed an issue with encoded URI from vue-router
- unified Item resource URLs
- removed the iframe for PlainTextViewer (it wasn't working properly)
  and replaced it with a pre
- fixed clear and search buttons tabindex
- fixed the information panel bumping up during the fade animation of
  tag's dropdown
- fixed some focus outlines not appearing correctly
- moved CSS variables to the :root context
- Code cleaning

GitHub: closes #217
GitHub: closes #300
GitHub: closes #297
GitHub: closes #105
GitHub: closes #267
GitHub: closes #275
GitHub: closes #228
GitHub: closes #215
GitHub: closes #112

1 files changed, 51 insertions, 0 deletions

diff --git a/viewer/src/components/LdLoading.vue b/viewer/src/components/LdLoading.vue
new file mode 100644
index 0000000..f392916
--- /dev/null
+++ b/viewer/src/components/LdLoading.vue
@@ -0,0 +1,51 @@
+<!--
+-- ldgallery - A static generator which turns a collection of tagged
+--             pictures into a searchable web gallery.
+--
+-- Copyright (C) 2020  Pacien TRAN-GIRARD
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU Affero General Public License for more details.
+--
+-- You should have received a copy of the GNU Affero General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<template>
+  <div :class="$style.loader">
+    <fa-icon
+      :icon="faSpinner"
+      size="6x"
+      pulse
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { faSpinner } from '@fortawesome/free-solid-svg-icons';
+</script>
+
+<style lang="scss" module>
+@import "~@/assets/scss/theme";
+
+.loader {
+  color: $loader-color;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  position: fixed;
+  top: var(--layout-top);
+  left: var(--layout-left);
+  bottom: 0;
+  right: 0;
+  z-index: 999;
+  pointer-events: none;
+}
+</style>