docs: polish iconography foundations

- split into 2 pages, icons and country symbols,  to aid readability
- added filters to icon preview, so you can show/hide solid/outline icons
- aligned the country symbol preview component with the icon preview (clear button etc, no results view)

site/docs/foundations/accent.mdx

@@ -1,6 +1,8 @@
 ---
 title: Accent
 layout: DetailTechnical
+sidebar:
+   priority: 14
 data:
   status: In progress
 ---

site/docs/foundations/color.mdx

@@ -1,7 +1,8 @@
 ---
 title: Color
 layout: DetailTechnical
-data:
+sidebar:
+   priority: 13
 ---
 
 Colors can be used to communicate meaning, establish visual hierarchy, and differentiate products, all while ensuring a cohesive and accessible experience. Colors are divided into several categories to communicate several concepts across the Salt design system.

site/docs/foundations/density.mdx

@@ -1,6 +1,8 @@
 ---
 title: Density
 layout: DetailTechnical
+sidebar:
+   priority: 12
 ---
 
 Density relates to the amount of content that can fit on a screen based on the [size](./size) and [spacing](./spacing) of components.

site/docs/foundations/division.mdx

@@ -1,6 +1,8 @@
 ---
 title: Division
 layout: DetailTechnical
+sidebar:
+   priority: 11
 data:
   status: In progress
 ---

site/docs/foundations/duration.mdx

@@ -1,6 +1,8 @@
 ---
 title: Duration
 layout: DetailTechnical
+sidebar:
+   priority: 10
 ---
 
 Duration represents the time between a user performing an action and the system giving feedback. Consistency in timing provides comfort and can increase trust in a system.

site/docs/foundations/iconography/country-symbols.mdx

@@ -0,0 +1,39 @@
+---
+title: Country Symbols
+layout: DetailTechnical
+---
+
+Country symbols represent a specific country and are used in contexts where geographical identification is necessary. 
+
+- Country symbols can be considered icons that are visually representative of a country or inter-governmental organisation. 
+- All flags are available in both circle and rectangle shapes.
+
+<Image
+  src="/img/foundations/iconography-countrysymbols-variant.png"
+  alt="Example of circular flag next to rectangular flag"
+/>
+
+## All country symbols
+
+<CountrySymbolPreview />
+
+## Scaling country symbols
+
+Country symbols have a standard size that changes in multiples across all four density levels.
+
+<ImageSwitcher
+  images={[
+    { src: "/img/foundations/scale-country.svg", alt: "" },
+    { src: "/img/foundations/scale-country-annotated.svg", alt: "" },
+  ]}
+  label="Show multipliers"
+/>
+
+| Size token         | Multiplier | High density (px) | Medium | Low | Touch |
+| ------------------ | ---------- | ----------------- | ------ | --- | ----- |
+| `--salt-size-base` | x1         | 20                | 28     | 36  | 44    |
+|                    | x2         | 40                | 56     | 72  | 88    |
+|                    | x3         | 60                | 84     | 108 | 132   |
+|                    | x4         | 80                | 112    | 144 | 176   |
+
+:fragment{src="./../fragments/feedback.mdx"}

site/docs/foundations/iconography/index.mdx

@@ -0,0 +1,46 @@
+---
+title: Icons
+layout: DetailTechnical
+sidebar:
+   groupLabel: Iconography
+   label: Icons
+   priority: 9
+---
+
+Icons are simplified visual representations of a specific action, object or concept.
+
+<Image
+  src="/img/foundations/iconography-icon-variants.png"
+  alt="Example of solid and outline icons"
+/>
+
+Icons come in two variant types: **Outline** and **Solid**. Please note that all icons within the icon set have an outline variant, but not all icons have a solid variant.
+
+**Solid icons** are faster to recognize than outline icons due to less visual noise, especially when the icon is complex. Solid icons better represent how we view objects, whereas outline icons are silhouettes and therefore can take longer to perceive.
+
+**Outline icons** place less emphasis on non-imperative items and are more recognizable when they have wider inner spacing. They’re also better to use when you need to make subtle design cues more noticeable.
+
+## All icons
+
+<IconPreview />
+
+## Scaling icons
+
+Icon size will vary based on use case and system requirements. Standard sizing ensures components maintain a consistent spatial relationship with surrounding elements.
+
+<ImageSwitcher
+  images={[
+    { src: "/img/foundations/scale-icon.svg", alt: "" },
+    { src: "/img/foundations/scale-icon-annotated.svg", alt: "" },
+  ]}
+  label="Show multipliers"
+/>
+
+| Size token         | Multiplier | High density (px) | Medium | Low | Touch |
+| ------------------ | ---------- | ----------------- | ------ | --- | ----- |
+| `--salt-size-icon` | x1         | 12 \*             | 12     | 14  | 16    |
+|                    | x2         | 20                | 24     | 28  | 32    |
+|                    | x3         | 30                | 36     | 42  | 48    |
+|                    | x4         | 40                | 48     | 56  | 64    |
+
+\* Icons have a minimum size set at 12px and should not be displayed any smaller. For high density this means the default size of an icon is 12px, but the rest of the scale grows based on small base dimension.

site/docs/foundations/modes.mdx

@@ -1,6 +1,8 @@
 ---
 title: Modes
 layout: DetailTechnical
+sidebar:
+   priority: 8
 data:
   status: In progress
 ---

site/docs/foundations/opacity.mdx

@@ -1,6 +1,8 @@
 ---
 title: Opacity
 layout: DetailTechnical
+sidebar:
+   priority: 7
 data:
   status: In progress
 ---

site/docs/foundations/responsiveness.mdx

@@ -1,6 +1,8 @@
 ---
 title: Responsiveness
 layout: DetailTechnical
+sidebar:
+   priority: 6
 ---
 
 A responsive layout makes dynamic changes to the appearance of a product in response to the size of the screen.

site/docs/foundations/scale.mdx

@@ -1,6 +1,8 @@
 ---
 title: Scale
 layout: DetailTechnical
+sidebar:
+   priority: 5
 ---
 
 Scale allows you to give components greater or lesser prominence within an interface through a multiplier of their default size.

site/docs/foundations/shadow.mdx

@@ -1,6 +1,8 @@
 ---
 title: Shadow
 layout: DetailTechnical
+sidebar:
+   priority: 4
 data:
   status: In progress
 ---

site/docs/foundations/size.mdx

@@ -1,6 +1,8 @@
 ---
 title: Size
 layout: DetailTechnical
+sidebar:
+   priority: 3
 ---
 
 Size refers to the restricted dimensions provided within the design system, such as an element's height and/or width.

site/docs/foundations/spacing.mdx

@@ -1,6 +1,8 @@
 ---
 title: Spacing
 layout: DetailTechnical
+sidebar:
+   priority: 2
 ---
 
 The organization of space is a key aspect of design. Spatial tokens help align layouts and create consistent visual rhythm.

site/docs/foundations/typography.mdx

@@ -1,6 +1,8 @@
 ---
 title: Typography
 layout: DetailTechnical
+sidebar:
+   priority: 1
 ---
 
 Typography involves the style and appearance of written language. It plays a crucial role in enhancing readability, establishing hierarchy, and setting a visual tone, resulting in more effective and expressive communication.

site/src/components/country-symbol-preview/CountrySymbolPreview.tsx

@@ -0,0 +1,113 @@
+import {
+  Button,
+  FlexItem,
+  FlexLayout,
+  FlowLayout,
+  Input,
+  StackLayout,
+  StatusIndicator,
+  Text,
+} from "@salt-ds/core";
+import { LazyCountrySymbol, countryMetaMap } from "@salt-ds/countries";
+import { CloseIcon, SearchIcon } from "@salt-ds/icons";
+import {
+  type ChangeEvent,
+  Suspense,
+  useDeferredValue,
+  useMemo,
+  useState,
+} from "react";
+import styles from "../icon-preview/IconPreview.module.css";
+
+export const CountrySymbolPreview = () => {
+  const [search, setSearch] = useState("");
+  const deferredSearch = useDeferredValue(search.toLowerCase());
+
+  const handleSearch = (event: ChangeEvent<HTMLInputElement>) => {
+    setSearch(event.target.value);
+  };
+
+  const handleClear = () => {
+    setSearch("");
+  };
+
+  const filteredSymbols = useMemo(() => {
+    return Object.values(countryMetaMap).filter(
+      ({ countryCode, countryName }) =>
+        countryCode.toLowerCase().includes(deferredSearch) ||
+        countryName.toLowerCase().includes(deferredSearch),
+    );
+  }, [deferredSearch]);
+
+  const renderSymbols = useMemo(() => {
+    if (filteredSymbols.length > 0) {
+      return (
+        <FlowLayout justify="start" gap={1}>
+          {filteredSymbols.map(({ countryCode, countryName }) => (
+            <StackLayout
+              style={{ width: 140 }}
+              gap={1}
+              align="center"
+              key={countryCode}
+            >
+              <LazyCountrySymbol code={countryCode} size={1} />
+              <Text>{countryCode}</Text>
+              <Text style={{ textAlign: "center" }}>{countryName}</Text>
+            </StackLayout>
+          ))}
+        </FlowLayout>
+      );
+    }
+    return (
+      <StackLayout className={styles.notFound} gap={3} align="center">
+        <StatusIndicator status="info" size={2} />
+        <StackLayout gap={1} align="center">
+          <Text styleAs="h4">
+            <strong>No country symbols found</strong>
+          </Text>
+          <Text>
+            No country symbols found for the search term: "
+            <strong>{deferredSearch}</strong>"
+          </Text>
+        </StackLayout>
+      </StackLayout>
+    );
+  }, [filteredSymbols, deferredSearch]);
+
+  return (
+    <Suspense fallback="Loading...">
+      <StackLayout className={styles.root} gap={1}>
+        <FlexLayout direction="row">
+          <FlexItem>
+            <Input
+              placeholder="Search country symbols"
+              aria-label="Search country symbols"
+              value={search}
+              onChange={handleSearch}
+              className={styles.search}
+              startAdornment={<SearchIcon />}
+              endAdornment={
+                search ? (
+                  <Button
+                    onClick={handleClear}
+                    appearance="transparent"
+                    sentiment="neutral"
+                    aria-label="Clear search"
+                  >
+                    <CloseIcon aria-hidden />
+                  </Button>
+                ) : null
+              }
+            />
+          </FlexItem>
+        </FlexLayout>
+        <div
+          className={styles.symbolsContainer}
+          style={{ overflow: "auto", maxHeight: 800, marginTop: "12px" }}
+        >
+          {renderSymbols}
+        </div>
+      </StackLayout>
+    </Suspense>
+  );
+};

site/src/components/country-symbol-preview/index.ts

@@ -0,0 +1 @@
+export * from "./CountrySymbolPreview";