feat(icons): expand brands icon pack and update all packs

Also, refactor icon resolution to avoid duplicated logic:

get_icon_svg.html	New shared core — alias resolution, pack lookup, hb fallback, user assets, hugo fallback. Returns raw SVG string.

get_icon.html	Thin wrapper — emoji handling, calls get_icon_svg, Unicode emoji fallback for bare names, attribute injection, safeHTML return.

get_icon_data.html	Thin wrapper — one-liner delegating to get_icon_svg.

modules/blox/layouts/_partials/functions/get_icon_data.html

@@ -1,63 +1,14 @@
-{{/* Hugo Blox: Get Icon Data for Preact Components */}}
-{{/* Documentation: https://hugoblox.com/blocks/ */}}
-{{/* License: https://github.com/HugoBlox/kit/blob/main/LICENSE.md */}}
+{{/* Return raw SVG content for Preact component consumption.
+     Thin wrapper around get_icon_svg.html — see that partial for resolution logic.
 
-{{/* 
-This partial returns raw SVG content for icons, designed for Preact component integration.
-
-PURPOSE:
-- Provides SVG strings that can be passed as props to Preact components
-- Enables dynamic icon rendering in client-side Preact blocks
-- Mirrors get_icon.html logic but returns raw content instead of safeHTML
-
-DIFFERENCE FROM get_icon.html:
-- get_icon.html: Returns safeHTML for direct template rendering in Go HTML templates
-- get_icon_data.html: Returns raw SVG string for JavaScript/Preact component consumption
-
-USAGE:
-{{ $icon_svg := partial "functions/get_icon_data" (dict "name" "arrow-right" "pack" "hero") }}
-Then pass $icon_svg as a prop to Preact components for client-side rendering.
-
-ICON PACK HANDLING:
-1. Hero pack (heroicons): Assembles <svg> wrapper around "body" content using pack "height"
-2. HB/Brands packs: Returns stored SVG strings as-is  
-3. User assets: Returns content from assets/media/icons/{pack}/{name}.svg
-4. Fallback: Returns Hugo brand icon if not found
-
-PARAMETERS:
-- name: Icon name, optionally with pack prefix (e.g., "arrow-right" or "hero/arrow-right")
-- pack: Icon pack name (defaults to "hero" if not specified in name)
+     USAGE:
+     {{ $svg := partial "functions/get_icon_data" (dict "name" "hero/arrow-right") }}
+     Then pass $svg as a prop to a Preact component.
 */}}
 
-{{/* Return the raw SVG content for a requested icon */}}
 {{- $name := .name | default "" -}}
-{{- $icon_content := "" -}}
-
+{{- $icon := "" -}}
 {{- if $name -}}
-  {{- $dirFile := path.Split $name -}}
-  {{- $pack := .pack | default (strings.Replace $dirFile.Dir "/" "") | default "hero" -}}
-  {{- $iconName := $dirFile.File -}}
-  {{- $icon_pack := index site.Data.icons $pack -}}
-
-  {{- with index (index $icon_pack "icons") $iconName -}}
-    {{- /* If this pack stores full SVG strings (hb/brands), return as-is. */ -}}
-    {{- if in (slice "hb" "brands") $pack -}}
-      {{- $icon_content = . -}}
-    {{- else -}}
-      {{- $icon_body := index . "body" -}}
-      {{- $icon_size := index $icon_pack "height" -}}
-      {{- $icon_content = printf `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 %s %s">%s</svg>` (cast.ToString $icon_size) (cast.ToString $icon_size) $icon_body -}}
-    {{- end -}}
-  {{- else -}}
-    {{- with resources.GetMatch (path.Join "media" "icons" $pack (printf "%s.svg" $iconName)) -}}
-      {{- $icon_content = .Content -}}
-    {{- else -}}
-      {{- /* Fallback to a default icon if not found. */ -}}
-      {{- with index (index site.Data.icons.brands "icons") "hugo" -}}
-        {{- $icon_content = . -}}
-      {{- end -}}
-    {{- end -}}
-  {{- end -}}
+  {{- $icon = partial "functions/get_icon_svg" (dict "name" $name "pack" (.pack | default "")) -}}
 {{- end -}}
-
-{{- $icon_content -}}
+{{- $icon -}}