fix(core): tighten reader-mode typography and spacing

- h1: explicit font-size:2em, font-weight:700, line-height:1.2
- byline: margin:.3em top, font-size:15px, line-height:1.5
- siteName: margin:.3em top, font-size:13px
- add p{margin:0 0 1.15em} for consistent paragraph spacing
- add figcaption rule: 14px italic gray with .5em top margin
- bump figure/img margin to 1.5em, blockquote margin to 1.2em

crates/archivr-core/src/downloader/singlefile.rs

@@ -108,13 +108,13 @@ const READER_MODE_SCRIPT: &str = concat!(
       if (article.title) document.title = article.title;
       var hdr = document.createElement('header');
       hdr.innerHTML =
-        '<h1 style="margin:0 0 .3em;font-family:-apple-system,sans-serif">' +
+        '<h1 style="margin:0 0 .4em;font-family:-apple-system,sans-serif;font-size:2em;line-height:1.2;font-weight:700">' +
           (article.title || '') + '</h1>' +
         (article.byline
-          ? '<p style="margin:0;color:#666;font-size:14px">' + article.byline + '</p>'
+          ? '<p style="margin:.3em 0 0;color:#666;font-size:15px;line-height:1.5">' + article.byline + '</p>'
           : '') +
         (article.siteName
-          ? '<p style="margin:.2em 0 0;color:#999;font-size:12px">' + article.siteName + '</p>'
+          ? '<p style="margin:.3em 0 0;color:#999;font-size:13px">' + article.siteName + '</p>'
           : '');
       hdr.style.cssText = 'margin-bottom:2em;padding-bottom:1em;border-bottom:1px solid #ddd';
       document.body.insertBefore(hdr, document.body.firstChild);
@@ -124,12 +124,14 @@ const READER_MODE_SCRIPT: &str = concat!(
         'font-family:Georgia,"Times New Roman",serif;font-size:18px;',
         'line-height:1.75;color:#1a1a1a;background:#fafaf8}',
         'h1,h2,h3,h4,h5,h6{font-family:-apple-system,BlinkMacSystemFont,sans-serif;',
-        'line-height:1.3;margin-top:1.5em}',
-        'img,figure,video{max-width:100%;height:auto;display:block;margin:1em 0}',
+        'line-height:1.3;margin-top:1.6em}',
+        'p{margin:0 0 1.15em}',
+        'img,figure,video{max-width:100%;height:auto;display:block;margin:1.5em 0}',
+        'figcaption{font-size:14px;color:#666;margin:.5em 0 0;font-style:italic;line-height:1.5}',
         'a{color:#0055cc}',
         'pre{background:#f4f4f4;padding:1em;border-radius:4px;overflow-x:auto;font-size:14px}',
         'code{background:#f4f4f4;padding:.1em .3em;border-radius:3px;font-size:14px}',
-        'blockquote{border-left:3px solid #ccc;margin:1em 0;padding-left:1.2em;color:#555}',
+        'blockquote{border-left:3px solid #ccc;margin:1.2em 0;padding-left:1.2em;color:#555}',
       ].join('');
       document.head.appendChild(style);
       _archivrReaderMark('applied');
@@ -540,12 +542,12 @@ fn save_with(
              document.querySelectorAll('[data-nosnippet]').forEach(function(el){\
                if(!el.firstElementChild&&!el.textContent.trim())el.remove();\
              });\
-             document.querySelectorAll('[data-slot=\"dropdown-menu-trigger\"]').forEach(function(btn){\
-               if(!/download/i.test(btn.textContent||''))return;\
-               var sec=btn.closest('section');if(!sec)return;\
-               var prev=sec.previousElementSibling;\
-               if(prev&&prev.tagName==='HEADER')prev.remove();\
-               sec.remove();\
+             document.querySelectorAll('section>.flex.justify-end>button[data-slot=\"dropdown-menu-trigger\"][type=\"button\"].flex.items-center>span').forEach(function(span){\
+               if(span.textContent.trim()!=='Download article')return;\
+               var wrap=span.closest('.flex.justify-end');\
+               var sec=wrap.closest('section');\
+               wrap.remove();\
+               if(sec&&sec.children.length===0)sec.remove();\
              });",
         );
     }