feat: add title and description fields to capture grammar

Implement | prefix for titles and // separator for descriptions
across the full stack: parser, schema, API, CLI, and web frontend.

- Parser: line-aware extraction for |title, |title // desc,
  // leading desc, body // inline desc. URL-safe (skips :// lines).
  Modifiers (#tag, @time, ^card) extracted from all segments.
- Schema: ALTER TABLE migration adds title, description columns
- DB: Entity/EntityUpdate structs, all CRUD queries updated
- API: title/description on create/update/response, body validation
  relaxed (title-only entries valid)
- CLI: shows title as scan label when present
- Web: parseInput mirrors Go parser, list shows title, detail pane
  renders title + description with double-click inline editing
- Tests: 10 new cases (grammar, entity, API) — 71 total, all pass

web/style.css

@@ -309,6 +309,25 @@ main {
 .glyph-decision { color: var(--note); }
 .glyph-link { color: var(--danger); }
 
+.entity-title {
+    font-family: var(--sans);
+    font-size: 12px;
+    font-weight: 500;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.entity-preview {
+    font-family: var(--mono);
+    font-size: 11px;
+    color: var(--muted);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    margin-left: 8px;
+}
+
 .entity-body {
     flex: 1;
     font-family: var(--mono);
@@ -385,6 +404,48 @@ main {
     color: var(--dim);
 }
 
+.detail-desc {
+    font-family: var(--sans);
+    font-size: 11px;
+    color: var(--muted);
+    margin-bottom: 4px;
+    cursor: text;
+    padding: 2px 6px;
+    margin-left: -6px;
+    border-radius: var(--r2);
+    transition: background var(--t-fast);
+}
+
+.detail-desc:hover { background: var(--raised); }
+
+.detail-title {
+    font-family: var(--sans);
+    font-size: 16px;
+    font-weight: 500;
+    margin-bottom: 12px;
+    cursor: text;
+    padding: 2px 6px;
+    margin-left: -6px;
+    border-radius: var(--r2);
+    transition: background var(--t-fast);
+}
+
+.detail-title:hover { background: var(--raised); }
+
+.detail-field-edit {
+    display: block;
+    width: 100%;
+    font-family: var(--sans);
+    font-size: 14px;
+    margin-bottom: 12px;
+    padding: 4px 8px;
+    background: var(--bg);
+    color: var(--text);
+    border: 1px solid var(--accent);
+    border-radius: var(--r2);
+    outline: none;
+}
+
 .detail-body {
     font-family: var(--mono);
     font-size: 13px;