site: editorial tooling, grid masonry fix, new reviews + finds

UI / dev tooling
- /find/ index: sort by file birthtime desc (sub-day chronology even when
  many finds share the same frontmatter date); render the captured-at on
  its own line under the host (~0.65rem mono muted)
- New dev-only filter at the top of /find/: All / Not in lists, persisted
  in localStorage; "not in lists" hides finds referenced by any superpost
- New editorial-tags chip strip on each find card (dev-only): selected
  tags visible by default, full picker on hover/focus-within with a "…"
  button for arbitrary tag entry; clicks copy /edit-find-tag <slug> <tag>
  to the clipboard via the existing EditConfirm singleton
- New optional editorialTags: string[] field on the find collection
- New src/data/editorial-tags.json — master list of available tags (initial
  set: ["delete"]); display order follows file order

/grid/ now uses the JS Masonry component instead of CSS column-count, so
the middle column no longer "dips"; tile hover updated to match the home
page's accent-glow / no-translate style

Content
- New review: apex-markdown-processor (graduated from find of same slug;
  hero reused from the find folder)
- New review: sindre-sorhus-older-mac-apps (graduated; intentionally
  hero-less per the source page's text-only design)
- New review: superkey (added by user; hero wired in src/lib/hero.ts)
- 24 new finds captured by /daily-finds across travel, jokes, quotes,
  product picks, and indie tools
- 2 new finds superposts: 2026-05-04-a-small-atlas, 2026-05-04-off-until-needed

Misc
- daily-finds.log.md and candidate-sources.md updated with the day's runs
- build-finds skill prompt iterated by user

src/lib/hero.ts

@@ -2,11 +2,13 @@ import type { ImageMetadata } from 'astro';
 
 import alcove from '../content/reviews/alcove/hero.png';
 import altTab from '../content/reviews/alt-tab/hero.jpg';
+import apex from '../content/reviews/apex-markdown-processor/hero.png';
 import esproP7 from '../content/reviews/espro-p7-french-press/hero.jpg';
 import folderPeek from '../content/reviews/folder-peek/screenshot.png';
 import hyperkey from '../content/reviews/hyperkey/hero.png';
 import ice from '../content/reviews/ice/ice-bar.png';
 import macMouseFix from '../content/reviews/mac-mouse-fix/studio-display.png';
+import superkey from '../content/reviews/superkey/hero.jpg';
 import tot from '../content/reviews/tot/seven-dots.png';
 
 import antinote from '../content/reviews/antinote/swipe.mp4';
@@ -25,11 +27,13 @@ export type Hero =
 export const heroes: Record<string, Hero | undefined> = {
   alcove: { kind: 'image', src: alcove },
   'alt-tab': { kind: 'image', src: altTab },
+  'apex-markdown-processor': { kind: 'image', src: apex },
   'espro-p7-french-press': { kind: 'image', src: esproP7 },
   'folder-peek': { kind: 'image', src: folderPeek },
   hyperkey: { kind: 'image', src: hyperkey },
   ice: { kind: 'image', src: ice },
   'mac-mouse-fix': { kind: 'image', src: macMouseFix },
+  superkey: { kind: 'image', src: superkey },
   tot: { kind: 'image', src: tot },
   antinote: { kind: 'video', src: antinote },
   cotypist: { kind: 'video', src: cotypist },