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, 28 insertions, 25 deletions

diff --git a/viewer/src/assets/scss/global.scss b/viewer/src/assets/scss/global.scss
index 06d975f..0a2f8f0 100644
--- a/viewer/src/assets/scss/global.scss
+++ b/viewer/src/assets/scss/global.scss
@@ -1,7 +1,7 @@
 /* ldgallery - A static generator which turns a collection of tagged
 --             pictures into a searchable web gallery.
 --
--- Copyright (C) 2019-2020  Guillaume FOUET
+-- Copyright (C) 2019-2022  Guillaume FOUET
 --
 -- This program is free software: you can redistribute it and/or modify
 -- it under the terms of the GNU Affero General Public License as
@@ -18,24 +18,37 @@
 */
 
 // Global CSS
-@import "~@/assets/scss/theme.scss";
+@import "theme";
 
-// === Forms
-
-.required label::after {
-  content: "*";
-  color: red;
+h1 {
+  font-size: $size-5;
+  font-weight: $weight-semibold;
+  line-height: 1.125;
+}
+h2 {
+  font-size: $size-6;
+  font-weight: $weight-normal;
 }
 
-button svg + span {
-  margin-left: 7px;
+// === Forms
+
+button {
+  cursor: pointer;
+  color: $button-color;
+  background-color: $button-background-color;
+  border: 1px solid $button-border-color;
+  padding: calc(0.375em - 1px) 0.75em;
+  font-family: inherit;
+  line-height: 1.5;
+  font-size: $size-6;
+  &:hover,&:focus {
+    border-color: $button-active-color;
+    outline: none;
+  }
 }
 
 // === Tools
 
-.nowrap {
-  white-space: nowrap;
-}
 .no-scroll {
   overflow: hidden;
 }
@@ -53,16 +66,15 @@ button svg + span {
 .flex-center {
   align-items: center;
 }
+.flex-grow-1 {
+  flex-grow: 1;
+}
 
 .fill {
   width: 100%;
   height: 100%;
 }
 
-.flex-grow-1 {
-  flex-grow: 1;
-}
-
 /**
  * Class for containers that centers its content vertically and horizontally,
  * preferably sticking to the container start if the container is smaller than the content.
@@ -76,15 +88,6 @@ button svg + span {
 
 // === Links
 
-.link {
-  color: $link;
-  cursor: pointer;
-  text-decoration: none;
-  &:hover, &:hover a {
-    color: $link-hover;
-  }
-}
-
 .disabled {
   color: $disabled-color !important;
   cursor: initial;