Show size and a draft indicator in snippet-library rows

src/app/components/SnippetLibrary.module.css

@@ -81,14 +81,9 @@
   cursor: pointer;
 }
 
-.nameRow {
-  position: relative;
-  display: flex;
-  align-items: center;
-  min-width: 0;
-}
-
 .name {
+  display: block;
+  max-width: 100%;
   font-size: 13px;
   font-weight: 500;
   white-space: nowrap;
@@ -96,14 +91,29 @@
   text-overflow: ellipsis;
 }
 
-/* Unpublished-draft indicator (spec §03D / §02 status). Floated into the row's
-   left padding gutter and positioned out of flow so the title's start never
-   shifts — dirty and clean rows stay aligned with each other and with the date. */
+/* Secondary metadata line (spec §02): status indicator · relative date · size. */
+.sub {
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+}
+
+/* Fixed-width leading slot for the status indicator. Always present (even when a
+   snippet is published and shows no dot) so the date never shifts and rows stay
+   aligned with one another. */
+.indicator {
+  flex: 0 0 auto;
+  width: 6px;
+  height: 6px;
+}
+
+/* Unpublished-draft indicator (spec §02 status; arch/10 §6 + council). The accent
+   hue — not a warning colour, since unpublished work is a normal state — and the
+   meaning rides on presence/absence + the accessible label, never colour alone. */
 .draftDot {
-  position: absolute;
-  left: calc(-1 * (var(--space-3) + var(--space-1)));
-  top: 50%;
-  transform: translateY(-50%);
+  /* display:block so the 6px box applies — an inline span with no text content
+     would ignore width/height and collapse to nothing. */
+  display: block;
   width: 6px;
   height: 6px;
   border-radius: 50%;
@@ -111,8 +121,12 @@
 }
 
 .date {
+  min-width: 0;
   font-size: 11px;
   color: var(--text-secondary);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .delete {

src/app/components/SnippetLibrary.tsx

@@ -2,12 +2,14 @@
  * Snippet Library — the left pane (spec §02).
  *
  * M1 scope: the always-visible list with a pinned "Create New Snippet" item,
- * selection/highlight, and delete. Search, sort controls, the metadata panel,
- * status/dataset indicators, and the storage monitor arrive in later milestones.
+ * selection/highlight, and delete. Each row carries a secondary metadata line —
+ * draft status indicator, relative date, and size (spec §02). Search, sort
+ * controls, the metadata panel, the dataset icon, and the storage monitor arrive
+ * in later milestones.
  */
 
 import { useShallow } from 'zustand/react/shallow';
-import { hasUnpublishedChanges } from '@core/snippet';
+import { formatSnippetSize, hasUnpublishedChanges, snippetSizeBytes } from '@core/snippet';
 import { confirm } from '../stores/ConfirmStore';
 import { useSnippetStore } from '../stores/SnippetStore';
 import styles from './SnippetLibrary.module.css';
@@ -63,40 +65,51 @@ export function SnippetLibrary() {
             No snippets yet — create your first one with the button above.
           </li>
         )}
-        {ordered.map((s) => (
-          <li key={s.id} className={`${styles.item} ${s.id === activeId ? styles.active : ''}`}>
-            {/* The row's selectable area is a real <button> so it's keyboard
-                operable (Enter/Space) and focusable — not a click-only <li>.
-                Not a listbox option: APG forbids interactive children, and each
-                row carries a delete button. */}
-            <button
-              type="button"
-              className={styles.itemMain}
-              aria-current={s.id === activeId ? 'true' : undefined}
-              onClick={() => selectSnippet(s.id)}
-            >
-              <span className={styles.nameRow}>
-                {hasUnpublishedChanges(s) && (
-                  <span
-                    className={styles.draftDot}
-                    title="Has unpublished draft changes"
-                    aria-label="Has unpublished draft changes"
-                  />
-                )}
+        {ordered.map((s) => {
+          // Size is omitted under ~1 KB per spec §02; null collapses the suffix.
+          const size = formatSnippetSize(snippetSizeBytes(s));
+          const date = relativeDate(s.modified);
+          return (
+            <li key={s.id} className={`${styles.item} ${s.id === activeId ? styles.active : ''}`}>
+              {/* The row's selectable area is a real <button> so it's keyboard
+                  operable (Enter/Space) and focusable — not a click-only <li>.
+                  Not a listbox option: APG forbids interactive children, and each
+                  row carries a delete button. */}
+              <button
+                type="button"
+                className={styles.itemMain}
+                aria-current={s.id === activeId ? 'true' : undefined}
+                onClick={() => selectSnippet(s.id)}
+              >
                 <span className={styles.name}>{s.name}</span>
-              </span>
-              <span className={styles.date}>{relativeDate(s.modified)}</span>
-            </button>
-            <button
-              className={styles.delete}
-              aria-label={`Delete ${s.name}`}
-              title="Delete snippet"
-              onClick={() => void handleDelete(s.id, s.name)}
-            >
-              ✕
-            </button>
-          </li>
-        ))}
+                {/* Secondary metadata line (spec §02): status · date · size. The
+                    indicator sits in a fixed-width leading slot so the date stays
+                    aligned across rows whether or not a snippet is dirty. Draft is
+                    flagged by presence + label, never colour alone (arch/10 §6). */}
+                <span className={styles.sub}>
+                  <span className={styles.indicator}>
+                    {hasUnpublishedChanges(s) && (
+                      <span
+                        className={styles.draftDot}
+                        title="Has unpublished draft changes"
+                        aria-label="Has unpublished draft changes"
+                      />
+                    )}
+                  </span>
+                  <span className={styles.date}>{size ? `${date} · ${size}` : date}</span>
+                </span>
+              </button>
+              <button
+                className={styles.delete}
+                aria-label={`Delete ${s.name}`}
+                title="Delete snippet"
+                onClick={() => void handleDelete(s.id, s.name)}
+              >
+                ✕
+              </button>
+            </li>
+          );
+        })}
       </ul>
     </div>
   );

src/core/snippet.test.ts

@@ -2,10 +2,12 @@ import { describe, expect, test } from 'vitest';
 import {
   CURRENT_SNIPPET_VERSION,
   createSnippet,
+  formatSnippetSize,
   generateSnippetName,
   hasUnpublishedChanges,
   SAMPLE_SPEC,
   sampleSpecText,
+  snippetSizeBytes,
 } from './snippet';
 
 describe('createSnippet', () => {
@@ -72,3 +74,36 @@ describe('hasUnpublishedChanges', () => {
     expect(hasUnpublishedChanges({ ...s, draftSpec: s.spec + ' ' })).toBe(true);
   });
 });
+
+describe('snippetSizeBytes', () => {
+  test('measures the draft as UTF-8 byte length, not character count', () => {
+    const s = createSnippet({ spec: 'abc' });
+    expect(snippetSizeBytes(s)).toBe(3);
+    // A 3-character string of multibyte glyphs is more than 3 bytes.
+    expect(snippetSizeBytes({ ...s, draftSpec: '€€€' })).toBe(9);
+  });
+
+  test('reflects the working draft, not the published spec', () => {
+    const s = createSnippet({ spec: 'ab' });
+    expect(snippetSizeBytes({ ...s, draftSpec: 'abcdef' })).toBe(6);
+  });
+});
+
+describe('formatSnippetSize', () => {
+  test('omits the size under ~1 KB (spec §02 clutter rule)', () => {
+    expect(formatSnippetSize(0)).toBeNull();
+    expect(formatSnippetSize(512)).toBeNull();
+    expect(formatSnippetSize(1023)).toBeNull();
+  });
+
+  test('shows whole KB at and above the threshold', () => {
+    expect(formatSnippetSize(1024)).toBe('1 KB');
+    expect(formatSnippetSize(2048)).toBe('2 KB');
+    expect(formatSnippetSize(1536)).toBe('2 KB'); // rounds to nearest KB
+  });
+
+  test('rolls over to MB for large payloads', () => {
+    expect(formatSnippetSize(1024 * 1024)).toBe('1 MB');
+    expect(formatSnippetSize(3 * 1024 * 1024)).toBe('3 MB');
+  });
+});

src/core/snippet.ts

@@ -121,3 +121,29 @@ export function createSnippet(options: CreateSnippetOptions = {}): Snippet {
 export function hasUnpublishedChanges(snippet: Snippet): boolean {
   return snippet.draftSpec !== snippet.spec;
 }
+
+/**
+ * Approximate payload size of a snippet, in bytes (spec §09 `size`). Measured on
+ * the working draft — the version the editor and preview currently show — as its
+ * UTF-8 byte length, so the figure tracks what the user is actually editing.
+ * `TextEncoder` is a platform global (like `crypto.randomUUID` above), not a
+ * browser/DOM API, so it stays within the portable core.
+ */
+export function snippetSizeBytes(snippet: Snippet): number {
+  return new TextEncoder().encode(snippet.draftSpec).length;
+}
+
+/** Below this we omit the size in the library to reduce clutter (spec §02). */
+const SIZE_DISPLAY_THRESHOLD = 1024;
+
+/**
+ * Human-readable size for the library row, or `null` when the snippet is small
+ * enough that the spec says to omit it (under ~1 KB). Rounded to whole KB/MB —
+ * a list hint, not a precise measure.
+ */
+export function formatSnippetSize(bytes: number): string | null {
+  if (bytes < SIZE_DISPLAY_THRESHOLD) return null;
+  const kb = bytes / 1024;
+  if (kb < 1024) return `${Math.round(kb)} KB`;
+  return `${Math.round(kb / 1024)} MB`;
+}