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/entities.go

@@ -10,22 +10,26 @@ import (
 )
 
 type CreateEntityRequest struct {
-	Body       string   `json:"body"`
-	Glyph      *string  `json:"glyph"`
-	TimeAnchor *string  `json:"time_anchor"`
-	Tags       []string `json:"tags"`
-	CardType   *string  `json:"card_type"`
-	CardData   *string  `json:"card_data"`
+	Body        string   `json:"body"`
+	Title       *string  `json:"title"`
+	Description *string  `json:"description"`
+	Glyph       *string  `json:"glyph"`
+	TimeAnchor  *string  `json:"time_anchor"`
+	Tags        []string `json:"tags"`
+	CardType    *string  `json:"card_type"`
+	CardData    *string  `json:"card_data"`
 }
 
 type UpdateEntityRequest struct {
-	Body       *string   `json:"body"`
-	Glyph      *string   `json:"glyph"`
-	TimeAnchor *string   `json:"time_anchor"`
-	Tags       *[]string `json:"tags"`
-	Pinned     *bool     `json:"pinned"`
-	CardType   *string   `json:"card_type"`
-	CardData   *string   `json:"card_data"`
+	Body        *string   `json:"body"`
+	Title       *string   `json:"title"`
+	Description *string   `json:"description"`
+	Glyph       *string   `json:"glyph"`
+	TimeAnchor  *string   `json:"time_anchor"`
+	Tags        *[]string `json:"tags"`
+	Pinned      *bool     `json:"pinned"`
+	CardType    *string   `json:"card_type"`
+	CardData    *string   `json:"card_data"`
 }
 
 type PromoteRequest struct {
@@ -119,8 +123,8 @@ func createEntity(store *db.Store) http.HandlerFunc {
 			return
 		}
 
-		if req.Body == "" {
-			writeError(w, http.StatusBadRequest, "invalid_input", "body is required")
+		if req.Body == "" && req.Title == nil {
+			writeError(w, http.StatusBadRequest, "invalid_input", "body or title is required")
 			return
 		}
 
@@ -134,10 +138,12 @@ func createEntity(store *db.Store) http.HandlerFunc {
 		}
 
 		e := &db.Entity{
-			Body:       req.Body,
-			Glyph:      glyph,
-			TimeAnchor: req.TimeAnchor,
-			Tags:       req.Tags,
+			Body:        req.Body,
+			Title:       req.Title,
+			Description: req.Description,
+			Glyph:       glyph,
+			TimeAnchor:  req.TimeAnchor,
+			Tags:        req.Tags,
 		}
 
 		if req.CardType != nil {
@@ -186,6 +192,8 @@ func updateEntity(store *db.Store) http.HandlerFunc {
 
 		u := &db.EntityUpdate{}
 		u.Body = req.Body
+		u.Title = req.Title
+		u.Description = req.Description
 		u.Tags = req.Tags
 		u.Pinned = req.Pinned
 		u.CardData = req.CardData