Back up unsaved editor work locally, structure the settings, fix archive accessibility

- The editor keeps unsaved changes in the browser and offers them
  after a crash, a closed tab or an expired session. No timed save on
  the server: every save is a full revision.
- The save status stays visible in narrow windows.
- Settings get a sticky section bar, two folded groups and a save bar
  that stays in view.
- The admin post list fetches terms and images once, not per post.
- Archive post titles are second-level headings, the archive head
  keeps full text contrast, the skip link sits above a sticky header,
  a linked image without alternative text names its link.
- The editor check starts through the dev router like the others.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

public/assets/site.css

@@ -12,7 +12,7 @@ p{hyphens:auto}
 /* Über dem Inhalt: der Kopf nimmt keinen Platz ein, die erste Sektion beginnt unter ihm. Farbe
    und Schatten kommen aus der Gestaltung des Kopfbereichs, auch die für den gescrollten Zustand. */
 .site-header.is-overlay{position:absolute;top:0;left:0;right:0;z-index:40;border-bottom:0;background:transparent;box-shadow:none}
-.site-header.is-overlay.is-sticky{position:fixed}.image-link{display:block;text-decoration:none}.brand{display:inline-flex;align-items:center;gap:5px;font-weight:800;font-size:28px;letter-spacing:-1.3px;text-decoration:none}.brand-icon{width:37px;height:37px;background:var(--ink);color:var(--mint);border-radius:10px;display:grid;place-items:center;margin-right:7px;font-size:27px;letter-spacing:-2px}.brand-light{font-weight:400}.site-header nav{display:flex;gap:32px;align-items:center;font-size:14px;font-weight:600}.site-header nav a{text-decoration:none;padding:12px 0}.site-header nav [aria-current=page]{text-decoration:none;font-weight:800}.site-header nav .nav-link{border:1px solid var(--ink);padding:13px 18px;border-radius:7px}.nav-link span{margin-left:18px}.block-section{padding:70px 0}.block-section:first-child{padding:74px 0 82px}h1,h2,h3{letter-spacing:-.05em;line-height:1.05;margin:0 0 24px}h1{font-size:clamp(48px,6.6vw,84px);font-weight:500}h2{font-size:clamp(32px,4vw,49px);font-weight:500}h3{font-size:26px;letter-spacing:-.035em;line-height:1.2}.block-text{font-size:18px;line-height:1.7;margin:0 0 23px;color:color-mix(in srgb,currentColor 82%,transparent);white-space:pre-line}.button{display:inline-flex;align-items:center;gap:32px;min-height:50px;margin-top:9px;padding:15px 21px;background:var(--ink);color:var(--paper);border-radius:7px;text-decoration:none;font-size:14px;font-weight:600}.button:hover{background:color-mix(in srgb,var(--ink) 88%,var(--paper))}.block-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(250px,100%),1fr));gap:22px;margin-top:38px;background:transparent!important}.block-column{min-width:0}.block-column .block-text{font-size:15px}.tone-mint{background:var(--mint)}.tone-ink{background:var(--ink);color:var(--paper)}.tone-ink .block-text{color:color-mix(in srgb,var(--paper) 86%,var(--ink))}.tone-ink .tone-ink .button{color:var(--ink);background:var(--mint)}.width-narrow>.section-inner{max-width:800px}.site-footer{border-top:1px solid var(--line)}.site-footer p,.site-footer>span{font-size:12px;color:var(--muted)}.site-footer .brand{font-size:22px}.skip-link{position:fixed;left:16px;top:-100px;z-index:10;background:var(--ink);color:var(--paper);padding:16px}.skip-link:focus{top:16px}img{display:block;max-width:100%;height:auto;border-radius:12px}.error-page{padding-block:100px}.error-page h1{max-width:800px}
+.site-header.is-overlay.is-sticky{position:fixed}.image-link{display:block;text-decoration:none}.brand{display:inline-flex;align-items:center;gap:5px;font-weight:800;font-size:28px;letter-spacing:-1.3px;text-decoration:none}.brand-icon{width:37px;height:37px;background:var(--ink);color:var(--mint);border-radius:10px;display:grid;place-items:center;margin-right:7px;font-size:27px;letter-spacing:-2px}.brand-light{font-weight:400}.site-header nav{display:flex;gap:32px;align-items:center;font-size:14px;font-weight:600}.site-header nav a{text-decoration:none;padding:12px 0}.site-header nav [aria-current=page]{text-decoration:none;font-weight:800}.site-header nav .nav-link{border:1px solid var(--ink);padding:13px 18px;border-radius:7px}.nav-link span{margin-left:18px}.block-section{padding:70px 0}.block-section:first-child{padding:74px 0 82px}h1,h2,h3{letter-spacing:-.05em;line-height:1.05;margin:0 0 24px}h1{font-size:clamp(48px,6.6vw,84px);font-weight:500}h2{font-size:clamp(32px,4vw,49px);font-weight:500}h3{font-size:26px;letter-spacing:-.035em;line-height:1.2}.block-text{font-size:18px;line-height:1.7;margin:0 0 23px;color:color-mix(in srgb,currentColor 82%,transparent);white-space:pre-line}.button{display:inline-flex;align-items:center;gap:32px;min-height:50px;margin-top:9px;padding:15px 21px;background:var(--ink);color:var(--paper);border-radius:7px;text-decoration:none;font-size:14px;font-weight:600}.button:hover{background:color-mix(in srgb,var(--ink) 88%,var(--paper))}.block-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(250px,100%),1fr));gap:22px;margin-top:38px;background:transparent!important}.block-column{min-width:0}.block-column .block-text{font-size:15px}.tone-mint{background:var(--mint)}#archiv-kopf .block-text{color:inherit}.tone-ink{background:var(--ink);color:var(--paper)}.tone-ink .block-text{color:color-mix(in srgb,var(--paper) 86%,var(--ink))}.tone-ink .tone-ink .button{color:var(--ink);background:var(--mint)}.width-narrow>.section-inner{max-width:800px}.site-footer{border-top:1px solid var(--line)}.site-footer p,.site-footer>span{font-size:12px;color:var(--muted)}.site-footer .brand{font-size:22px}.skip-link{position:fixed;left:16px;top:-100px;z-index:60;background:var(--ink);color:var(--paper);padding:16px}.skip-link:focus{top:16px}img{display:block;max-width:100%;height:auto;border-radius:12px}.error-page{padding-block:100px}.error-page h1{max-width:800px}
 @media(max-width:767px){.shell{width:calc(100% - 36px)}.site-header nav{width:100%;justify-content:space-between;gap:12px;font-size:12px}.site-header nav .nav-link{padding:10px}.nav-link span{margin-left:6px}.block-section,.block-section:first-child{padding-block:48px}h1{font-size:49px}.block-text{font-size:16px}.site-footer{align-items:flex-start;flex-direction:column;gap:10px}.site-footer p{margin:0}.block-row{gap:16px}}
 
 /* Menus. Submenus open with details/summary, so the navigation works without JavaScript. */
@@ -27,15 +27,15 @@ p{hyphens:auto}
 .menu-level-2{flex-direction:column;align-items:flex-start;gap:2px}
 
 /* Posts */
-.post-list{list-style:none;margin:0;padding:0;display:grid;gap:26px}.post-list-karten{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.post-list-liste{gap:18px}.post-list-liste .post-card{flex-direction:row;align-items:stretch}.post-list-liste .post-image{flex:0 0 34%;max-width:300px}.post-list-liste .post-image img{height:100%;aspect-ratio:auto;min-height:170px}.post-list-liste .post-body{flex:1 1 auto;align-content:center;padding:22px 26px}.post-list-wechsel{gap:0;counter-reset:beitrag}.post-list-wechsel .post-card{position:relative;counter-increment:beitrag;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:0 56px;padding:38px 0;background:transparent;border:0;border-radius:0;overflow:visible}.post-list-wechsel .post-card + .post-card{border-top:1px solid var(--line)}.post-list-wechsel .post-image{border-radius:20px;overflow:hidden;box-shadow:0 18px 46px -22px color-mix(in srgb,var(--ink) 55%,transparent)}.post-list-wechsel .post-image img{aspect-ratio:16/10;border-radius:20px}.post-list-wechsel .post-body{padding:0;display:grid;gap:12px;align-content:center}.post-list-wechsel .post-body::before{content:counter(beitrag,decimal-leading-zero);font-size:13px;font-weight:800;letter-spacing:2px;color:var(--accent)}.post-list-wechsel .post-card h3{font-size:28px;line-height:1.18;letter-spacing:-.5px}.post-list-wechsel .post-excerpt{margin:0;max-width:46ch}.post-list-wechsel .post-meta,.post-list-wechsel .post-terms{margin:0}.post-list-wechsel .post-more{display:inline-flex;align-items:center;gap:8px;margin-top:4px;font-size:15px;font-weight:700;color:var(--accent);text-decoration:none;width:fit-content}
+.post-list{list-style:none;margin:0;padding:0;display:grid;gap:26px}.post-list-karten{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.post-list-liste{gap:18px}.post-list-liste .post-card{flex-direction:row;align-items:stretch}.post-list-liste .post-image{flex:0 0 34%;max-width:300px}.post-list-liste .post-image img{height:100%;aspect-ratio:auto;min-height:170px}.post-list-liste .post-body{flex:1 1 auto;align-content:center;padding:22px 26px}.post-list-wechsel{gap:0;counter-reset:beitrag}.post-list-wechsel .post-card{position:relative;counter-increment:beitrag;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:0 56px;padding:38px 0;background:transparent;border:0;border-radius:0;overflow:visible}.post-list-wechsel .post-card + .post-card{border-top:1px solid var(--line)}.post-list-wechsel .post-image{border-radius:20px;overflow:hidden;box-shadow:0 18px 46px -22px color-mix(in srgb,var(--ink) 55%,transparent)}.post-list-wechsel .post-image img{aspect-ratio:16/10;border-radius:20px}.post-list-wechsel .post-body{padding:0;display:grid;gap:12px;align-content:center}.post-list-wechsel .post-body::before{content:counter(beitrag,decimal-leading-zero);font-size:13px;font-weight:800;letter-spacing:2px;color:var(--accent)}.post-list-wechsel .post-card :is(h2,h3){font-size:28px;line-height:1.18;letter-spacing:-.5px}.post-list-wechsel .post-excerpt{margin:0;max-width:46ch}.post-list-wechsel .post-meta,.post-list-wechsel .post-terms{margin:0}.post-list-wechsel .post-more{display:inline-flex;align-items:center;gap:8px;margin-top:4px;font-size:15px;font-weight:700;color:var(--accent);text-decoration:none;width:fit-content}
 .post-more::after{content:'';display:inline-block;width:1em;height:1em;background:currentColor;-webkit-mask:var(--kant-svg-pfeil) center/contain no-repeat;mask:var(--kant-svg-pfeil) center/contain no-repeat;vertical-align:-.12em;transition:transform .2s}
-.post-more:hover::after{transform:translateX(4px)}.post-list-wechsel .post-more::after{content:'\2192'}.post-list-wechsel .post-card:nth-child(even) .post-image{order:2}.post-list-wechsel .post-card:nth-child(even) .post-body{order:1}@media(max-width:767px){.post-list-wechsel .post-card{grid-template-columns:1fr;gap:18px;padding:26px 0}.post-list-wechsel .post-card:nth-child(even) .post-image{order:0}.post-list-wechsel .post-card:nth-child(even) .post-body{order:0}.post-list-wechsel .post-card h3{font-size:22px}}.post-list-kompakt{gap:0}.post-list-kompakt .post-card{flex-direction:row;align-items:baseline;justify-content:space-between;gap:18px;background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;overflow:visible}.post-list-kompakt .post-body{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 18px;padding:16px 2px}.post-list-kompakt .post-meta,.post-list-kompakt .post-terms{margin:0}.post-list-kompakt .post-excerpt{flex:1 1 100%;margin:0}
+.post-more:hover::after{transform:translateX(4px)}.post-list-wechsel .post-more::after{content:'\2192'}.post-list-wechsel .post-card:nth-child(even) .post-image{order:2}.post-list-wechsel .post-card:nth-child(even) .post-body{order:1}@media(max-width:767px){.post-list-wechsel .post-card{grid-template-columns:1fr;gap:18px;padding:26px 0}.post-list-wechsel .post-card:nth-child(even) .post-image{order:0}.post-list-wechsel .post-card:nth-child(even) .post-body{order:0}.post-list-wechsel .post-card :is(h2,h3){font-size:22px}}.post-list-kompakt{gap:0}.post-list-kompakt .post-card{flex-direction:row;align-items:baseline;justify-content:space-between;gap:18px;background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;overflow:visible}.post-list-kompakt .post-body{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 18px;padding:16px 2px}.post-list-kompakt .post-meta,.post-list-kompakt .post-terms{margin:0}.post-list-kompakt .post-excerpt{flex:1 1 100%;margin:0}
 .post-card{display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:18px;overflow:hidden}.post-card>.post-body{display:grid;gap:10px;padding:20px 22px 22px}
 .post-image{display:block;position:relative;overflow:hidden;text-decoration:none}.post-view{position:absolute;inset:0;display:grid;place-items:center;background:color-mix(in srgb,var(--ink) 55%,transparent);color:#fff;font-weight:700;font-size:15px;letter-spacing:.4px;opacity:0}.post-card:hover .post-view,.post-card:focus-within .post-view{opacity:1}.post-image img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;border-radius:0;display:block;background:var(--ink)}
 .kant h1 mark,.kant h2 mark,.kant h3 mark{background:transparent;color:var(--accent);padding:0}
-.kant .post-card h3{margin:0;font-size:19px;font-weight:800;line-height:1.12;color:var(--ink);letter-spacing:-.2px}
-.post-card h3 a{text-decoration:none}
-.post-card h3 a:hover{text-decoration:underline}
+.kant .post-card :is(h2,h3){margin:0;font-size:19px;font-weight:800;line-height:1.12;color:var(--ink);letter-spacing:-.2px}
+.post-card :is(h2,h3) a{text-decoration:none}
+.post-card :is(h2,h3) a:hover{text-decoration:underline}
 .post-meta,.post-header{display:flex;flex-wrap:wrap;gap:6px 16px;align-items:baseline;font-size:13px;margin:0}
 .post-header{padding-block:22px 0}
 .post-excerpt{margin:0;line-height:1.65}