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, 57 insertions, 0 deletions

diff --git a/viewer/src/components/LdNotice.vue b/viewer/src/components/LdNotice.vue
new file mode 100644
index 0000000..f53997b
--- /dev/null
+++ b/viewer/src/components/LdNotice.vue
@@ -0,0 +1,57 @@
+<!--
+-- 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/>.
+-->
+
+<!-- eslint-disable vue/no-v-html -->
+<template>
+  <div class="flex-column container-vh-centering">
+    <fa-icon
+      :class="$style.icon"
+      :icon="props.icon"
+      size="6x"
+    />
+    <div
+      :class="$style.message"
+      v-html="props.message"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { IconDefinition } from '@fortawesome/fontawesome-common-types';
+import { PropType } from 'vue';
+
+const props = defineProps({
+  icon: { type: Object as PropType<IconDefinition>, required: true },
+  message: { type: String, required: true },
+});
+</script>
+
+<style lang="scss" module>
+@import "~@/assets/scss/theme.scss";
+
+.icon {
+  color: $disabled-color;
+}
+
+.message {
+  color: $text-light;
+  margin-top: 0.5em;
+}
+</style>