chore: grounwork for SEO features

docs/design/components.md

@@ -77,3 +77,13 @@ Frames: `DirectoryFrame.dc.html` (Sites, Authors, editor section content; the li
 | CreateAuthorHint | New | UAlert closable | Dismissal stored per user |
 | Default badge, Linked badge, Guest badge | New | UBadge | Sand fill, info soft fill, outline |
 | Row menu with a disabled item | Existing + change | UDropdownMenu + UTooltip | The item stays focusable |
+| SearchSharingSection | New | UCollapsible + UButton + USeparator | Editor sidebar and Details sheet, after Site and authors. Summary: Ready, N suggestions, Hidden from search, Checking… |
+| SeoPanel | New | USlideover (desktop 960 px) / bottom sheet (mobile) + UFormField, UInput, UTextarea, USwitch, UCollapsible | Defined once in DirectoryFrame. Reuses SlugField, MediaField and the picker. Fallback chip: dashed outline, "Using …" |
+| SoftCounter | New | text | Mono, "n / max". Amber (--ui-warning) outside the recommended range, never red, never blocks |
+| SearchPreview | New | UCard | Desktop and Mobile toggle (UTabs, 2 items). Title cut at 60 (desktop) or 70 (mobile) characters including the template, description at 160 or 120 |
+| SocialCardPreview | New | UCard | 1.91:1 image, host, title, 2-line description; fallback chips |
+| SuggestionList | New | UAlert-style rows + UButton (link, ghost icon) | Calm elevated block. States: list, all good, checking. Per-article dismiss; "Show dismissed" |
+| ApiPreviewDialog | New | UModal / bottom sheet + UTabs + UButton + UAlert | Formatted and Raw; Copy JSON; loading, error, draft note |
+| SeoStatusChip | New | UBadge | Lightbulb + count (warning soft) or eye-off "Hidden" (outline). Articles rows and cards |
+| NeedsAttentionToggle | New | UButton (pressed state) | Articles toolbar, sand when on |
+| TitleTemplateField | New | UInput + live example | Sites form |