fix(explorer): show file name instead of slug if no file data (closes #1822)

quartz/plugins/emitters/contentIndex.tsx

@@ -12,6 +12,7 @@ import DepGraph from "../../depgraph"
 export type ContentIndexMap = Map<FullSlug, ContentDetails>
 export type ContentDetails = {
   slug: FullSlug
+  filePath: FilePath
   title: string
   links: SimpleSlug[]
   tags: string[]
@@ -126,6 +127,7 @@ export const ContentIndex: QuartzEmitterPlugin<Partial<Options>> = (opts) => {
         if (opts?.includeEmptyFiles || (file.data.text && file.data.text !== "")) {
           linkIndex.set(slug, {
             slug,
+            filePath: file.data.filePath!,
             title: file.data.frontmatter?.title!,
             links: file.data.links ?? [],
             tags: file.data.frontmatter?.tags ?? [],