feat: sidebar tabs support (#6213)

* feat: Sidebar tabs support [wip]

* tab trigger styling tweaks

* add `:hover` & `:active` states

* replace `@dwelle/tunnel-rat` with `tunnel-rat`

* make stuff more explicit

- remove `Sidebar.Header` fallback (host apps need to render manually), and stop tunneling it (render in place)
- make `docked` state explicit
- stop tunneling `Sidebar.TabTriggers` (render in place)

* redesign sidebar / library as per latest spec

* support no label on `Sidebar.Trigger`

* add Sidebar `props.onStateChange`

* style fixes

* make `appState.isSidebarDocked` into a soft user preference

* px -> rem & refactor

* remove `props.renderSidebar`

* update tests

* remove

* refactor

* rename constants

* tab triggers styling fixes

* factor out library-related logic from generic sidebar trigger

* change `props.onClose` to `onToggle`

* rename `props.value` -> `props.tab`

* add displayNames

* allow HTMLAttributes on applicable compos

* fix example App

* more styling tweaks and fixes

* fix not setting `dockable`

* more style fixes

* fix and align sidebar header button styling

* make DefaultSidebar dockable on if host apps supplies `onDock`

* stop `Sidebar.Trigger` hiding label on mobile

this should be only the default sidebar trigger behavior, and for that we don't need to use `device` hook as we handle in CSS

* fix `dockable` prop of defaultSidebar

* remove extra `typescript` dep

* remove `defaultTab` prop

in favor of explicit `tab` value in `<Sidebar.Trigger/>` and `toggleSidebar()`, to reduce API surface area and solve inconsistency of `appState.openSidebar.tab` not reflecting actual UI value if `defaultTab` was supported (without additional syncing logic which feels like the wrong solution).

* remove `onToggle` in favor of `onStateChange`

reducing API surface area

* fix restore

* comment no longer applies

* reuse `Button` component in sidebar buttons

* fix tests

* split Sidebar sub-components into files

* remove `props.dockable` in favor of `props.onDock` only

* split tests

* fix sidebar showing dock button if no `props.docked` supplied & add more tests

* reorder and group sidebar tests

* clarify

* rename classes & dedupe css

* refactor tests

* update changelog

* update changelog

---------

Co-authored-by: barnabasmolnar <barnabas@excalidraw.com>

src/css/styles.scss

@@ -567,7 +567,7 @@
       border-radius: 0;
     }
 
-    .library-button {
+    .default-sidebar-trigger {
       border: 0;
     }
   }

src/css/theme.scss

@@ -78,10 +78,13 @@
 
   --color-selection: #6965db;
 
+  --color-icon-white: #{$oc-white};
+
   --color-primary: #6965db;
   --color-primary-darker: #5b57d1;
   --color-primary-darkest: #4a47b1;
   --color-primary-light: #e3e2fe;
+  --color-primary-light-darker: #d7d5ff;
 
   --color-gray-10: #f5f5f5;
   --color-gray-20: #ebebeb;
@@ -161,10 +164,13 @@
     // will be inverted to a lighter color.
     --color-selection: #3530c4;
 
+    --color-icon-white: var(--color-gray-90);
+
     --color-primary: #a8a5ff;
     --color-primary-darker: #b2aeff;
     --color-primary-darkest: #beb9ff;
     --color-primary-light: #4f4d6f;
+    --color-primary-light-darker: #43415e;
 
     --color-text-warning: var(--color-gray-80);
 

src/css/variables.module.scss

@@ -72,7 +72,14 @@
 
   &:hover {
     background-color: var(--button-hover-bg, var(--island-bg-color));
-    border-color: var(--button-hover-border, var(--default-border-color));
+    border-color: var(
+      --button-hover-border,
+      var(--button-border, var(--default-border-color))
+    );
+    color: var(
+      --button-hover-color,
+      var(--button-color, var(--text-primary-color, inherit))
+    );
   }
 
   &:active {
@@ -81,11 +88,14 @@
   }
 
   &.active {
-    background-color: var(--color-primary-light);
-    border-color: var(--color-primary-light);
+    background-color: var(--button-selected-bg, var(--color-primary-light));
+    border-color: var(--button-selected-border, var(--color-primary-light));
 
     &:hover {
-      background-color: var(--color-primary-light);
+      background-color: var(
+        --button-selected-hover-bg,
+        var(--color-primary-light)
+      );
     }
 
     svg {