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

internal/api/helpers.go

@@ -18,6 +18,8 @@ type EntityResponse struct {
 	CreatedAt   string   `json:"created_at"`
 	ModifiedAt  string   `json:"modified_at"`
 	Body        string   `json:"body"`
+	Title       *string  `json:"title"`
+	Description *string  `json:"description"`
 	Glyph       string   `json:"glyph"`
 	TimeAnchor  *string  `json:"time_anchor"`
 	CompletedAt *string  `json:"completed_at"`
@@ -50,14 +52,16 @@ func decodeJSON(w http.ResponseWriter, r *http.Request, dst any) bool {
 
 func entityToResponse(e *db.Entity) EntityResponse {
 	resp := EntityResponse{
-		ID:         e.ID,
-		CreatedAt:  e.CreatedAt.Format(time.RFC3339),
-		ModifiedAt: e.ModifiedAt.Format(time.RFC3339),
-		Body:       e.Body,
-		Glyph:      string(e.Glyph),
-		Pinned:     e.Pinned,
-		Tags:       e.Tags,
-		UseCount:   e.UseCount,
+		ID:          e.ID,
+		CreatedAt:   e.CreatedAt.Format(time.RFC3339),
+		ModifiedAt:  e.ModifiedAt.Format(time.RFC3339),
+		Body:        e.Body,
+		Title:       e.Title,
+		Description: e.Description,
+		Glyph:       string(e.Glyph),
+		Pinned:      e.Pinned,
+		Tags:        e.Tags,
+		UseCount:    e.UseCount,
 	}
 	if resp.Tags == nil {
 		resp.Tags = []string{}