feat: hide category pills when category is already wiki-linked in content

Reduce visual clutter by only showing category pills for categories that
aren't already mentioned as wiki links in the note's content.

Implementation:
- Store outgoing links separately in links.ts before adding categories
- Added outgoingLinks to vfile DataMap type
- Modified CategoryList to filter out categories already in outgoingLinks
- Only category pills for unlinked categories are now displayed

Example:
If a note has categories: [[LLM]], [[Anthropic]], [[AI]] and the content
mentions [[LLM]] and [[Anthropic]], only the AI category pill will appear.

This follows Wikipedia's principle of avoiding redundant links and reduces
visual clutter while maintaining backlinks and graph connections.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

quartz/components/CategoryList.tsx

@@ -1,13 +1,26 @@
-import { FullSlug, resolveRelative, slugifyFilePath } from "../util/path"
+import { FullSlug, resolveRelative, slugifyFilePath, simplifySlug } from "../util/path"
 import { QuartzComponent, QuartzComponentConstructor, QuartzComponentProps } from "./types"
 import { classNames } from "../util/lang"
 
 const CategoryList: QuartzComponent = ({ fileData, displayClass }: QuartzComponentProps) => {
   const categories = fileData.frontmatter?.categories
+  const outgoingLinks = fileData.outgoingLinks || []
+
   if (categories && categories.length > 0) {
+    // Only show categories that aren't already wiki-linked in the content
+    const categoriesToShow = categories.filter((category) => {
+      const slug = slugifyFilePath((category + ".md") as any)
+      const simpleSlug = simplifySlug(slug)
+      return !outgoingLinks.includes(simpleSlug)
+    })
+
+    if (categoriesToShow.length === 0) {
+      return null
+    }
+
     return (
       <ul class={classNames(displayClass, "categories")}>
-        {categories.map((category) => {
+        {categoriesToShow.map((category) => {
           // Link directly to the note, not to a category aggregation page
           const slug = slugifyFilePath((category + ".md") as any)
           const linkDest = resolveRelative(fileData.slug!, slug)

quartz/plugins/transformers/links.ts

@@ -159,6 +159,10 @@ export const CrawlLinks: QuartzTransformerPlugin<Partial<Options>> = (userOpts)
               }
             })
 
+            // Store outgoing links separately (before adding categories)
+            // This allows CategoryList to hide categories already linked in content
+            file.data.outgoingLinks = Array.from(outgoing)
+
             // Include categories as links for backlinks and graph
             const categories = file.data.frontmatter?.categories ?? []
             file.data.links = [...outgoing, ...categories]
@@ -172,5 +176,6 @@ export const CrawlLinks: QuartzTransformerPlugin<Partial<Options>> = (userOpts)
 declare module "vfile" {
   interface DataMap {
     links: SimpleSlug[]
+    outgoingLinks: SimpleSlug[]
   }
 }