fix(web): rich markdown notes get block structure — paragraphs, quotes, lists, code

Tailwind preflight zeroes p/blockquote/list margins globally, so notes
rendered through renderNoteHtml collapsed flat: blank lines between
paragraphs vanished, blockquotes were indistinguishable from body text,
lists had no bullets/indent, code blocks had no padding. The parser was
always correct — the loss was CSS at the x-html display sites.

One shared scoped block (.note-rich, in @layer components so it
outranks base preflight): p+p margin-top, blockquote bar + indent +
secondary color, list markers + padding, pre/code padding + themed bg,
modest heading sizes, underlined links, table borders, em-based so it
scales with each site's text-xs/text-sm context. Applied at all three
display sites: reader notes-drawer rows (replaces the unused
reader-note-rich hook), the 📝 highlight note line, and the banner's
expanded body.

The regenerated _templ.go files also catch up two stale .templ changes
that had shipped without regeneration (the selection popover's Adjust
button, the banner delete ternary) — the Docker build regenerates at
image-build, so the served site always matched the sources.

Verified live (headless Chromium against the dev stack): .note-rich in
the served stylesheet; p+p computed marginTop 9.6px, blockquote 3px
solid border-left, ul disc + 22.4px indent, pre padded + themed bg.

web/static/input.css

@@ -986,6 +986,81 @@
     outline: 2px solid #3b82f6;
     outline-offset: 1px;
   }
+  /* Markdown notes render through renderNoteHtml (markdown.ts) into
+     x-html containers at three sites (reader notes-drawer rows, the 📝
+     highlight note line, the banner's expanded body). Tailwind preflight
+     zeroes p/blockquote/list margins globally, which flattened paragraphs
+     single-spaced and left blockquotes/heads indistinguishable from body
+     text — this block restores block structure. em-based so it scales
+     with each site's text-xs/text-sm context. */
+  .note-rich p {
+    margin: 0;
+  }
+  .note-rich p + p {
+    margin-top: 0.6em;
+  }
+  .note-rich h1, .note-rich h2, .note-rich h3,
+  .note-rich h4, .note-rich h5, .note-rich h6 {
+    margin: 0.8em 0 0.4em;
+    font-weight: 600;
+    line-height: 1.3;
+  }
+  .note-rich h1 { font-size: 1.25em; }
+  .note-rich h2 { font-size: 1.15em; }
+  .note-rich h3, .note-rich h4 { font-size: 1.05em; }
+  .note-rich h5, .note-rich h6 { font-size: 1em; }
+  .note-rich blockquote {
+    margin: 0.6em 0;
+    padding: 0.1em 0 0.1em 0.75em;
+    border-left: 3px solid color-mix(in srgb, var(--text-secondary) 55%, transparent);
+    color: var(--text-secondary);
+  }
+  .note-rich ul, .note-rich ol {
+    margin: 0.6em 0;
+    padding-left: 1.4em;
+  }
+  .note-rich ul { list-style: disc; }
+  .note-rich ol { list-style: decimal; }
+  .note-rich li { margin: 0.15em 0; }
+  .note-rich li + li { margin-top: 0.25em; }
+  .note-rich li > p { margin: 0; }
+  .note-rich pre {
+    margin: 0.6em 0;
+    padding: 0.6em 0.75em;
+    overflow-x: auto;
+    border-radius: 0.375rem;
+    background-color: color-mix(in srgb, var(--bg-secondary) 80%, transparent);
+    border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
+  }
+  .note-rich pre code {
+    background: none;
+    padding: 0;
+    font-size: 0.9em;
+  }
+  .note-rich code {
+    font-size: 0.9em;
+    padding: 0.1em 0.3em;
+    border-radius: 0.25rem;
+    background-color: color-mix(in srgb, var(--bg-secondary) 80%, transparent);
+  }
+  .note-rich a {
+    text-decoration: underline;
+    text-underline-offset: 2px;
+  }
+  .note-rich hr {
+    margin: 0.8em 0;
+  }
+  .note-rich table {
+    margin: 0.6em 0;
+    border-collapse: collapse;
+    font-size: 0.95em;
+  }
+  .note-rich th, .note-rich td {
+    border: 1px solid var(--border);
+    padding: 0.25em 0.5em;
+    text-align: left;
+  }
+  .note-rich th { font-weight: 600; }
   .reader-tabs {
     display: flex;
     border-bottom: 1px solid var(--border);