feat(tui): add tag autocomplete and query composition

Tag autocomplete shows suggestions when typing #partial in capture bar.
Tab/enter accepts, up/down navigates, esc dismisses.

Query composition extends ? search with date filters (@today, @week,
@month, <7d, >30d), card type filters (^snippet), all composable
with existing text and tag filters.

internal/parse/grammar.go

@@ -4,19 +4,23 @@ import (
 	"fmt"
 	"strconv"
 	"strings"
+	"time"
 )
 
 type Result struct {
-	Body        string
-	Glyph       string
-	Title       *string
-	Description *string
-	TimeAnchor  *string
-	Tags        []string
-	FilterTags  []string
-	CardSuffix  *string
-	Pin         bool
-	Query       bool
+	Body          string
+	Glyph         string
+	Title         *string
+	Description   *string
+	TimeAnchor    *string
+	Tags          []string
+	FilterTags    []string
+	CardSuffix    *string
+	Pin           bool
+	Query         bool
+	QueryDateFrom *string
+	QueryDateTo   *string
+	QueryCardType *string
 }
 
 var validCardTypes = map[string]string{
@@ -66,11 +70,48 @@ func Parse(input string) (*Result, error) {
 		r.Glyph = ""
 		tokens := strings.Fields(remaining)
 		var bodyParts []string
+		now := time.Now()
 		for _, tok := range tokens {
-			if strings.HasPrefix(tok, "#") && len(tok) > 1 && !strings.HasPrefix(tok, "##") {
+			switch {
+			case strings.HasPrefix(tok, "#") && len(tok) > 1 && !strings.HasPrefix(tok, "##"):
 				tag := strings.ToLower(tok[1:])
 				r.FilterTags = append(r.FilterTags, tag)
-			} else {
+			case tok == "@today":
+				d := now.Format("2006-01-02")
+				r.QueryDateFrom = &d
+				r.QueryDateTo = &d
+			case tok == "@yesterday":
+				d := now.AddDate(0, 0, -1).Format("2006-01-02")
+				r.QueryDateFrom = &d
+				r.QueryDateTo = &d
+			case tok == "@week":
+				d := now.AddDate(0, 0, -7).Format("2006-01-02")
+				r.QueryDateFrom = &d
+			case tok == "@month":
+				d := now.AddDate(0, -1, 0).Format("2006-01-02")
+				r.QueryDateFrom = &d
+			case strings.HasPrefix(tok, ">") && strings.HasSuffix(tok, "d"):
+				if n, err := strconv.Atoi(tok[1 : len(tok)-1]); err == nil && n > 0 {
+					d := now.AddDate(0, 0, -n).Format("2006-01-02")
+					r.QueryDateTo = &d
+				} else {
+					bodyParts = append(bodyParts, tok)
+				}
+			case strings.HasPrefix(tok, "<") && strings.HasSuffix(tok, "d"):
+				if n, err := strconv.Atoi(tok[1 : len(tok)-1]); err == nil && n > 0 {
+					d := now.AddDate(0, 0, -n).Format("2006-01-02")
+					r.QueryDateFrom = &d
+				} else {
+					bodyParts = append(bodyParts, tok)
+				}
+			case strings.HasPrefix(tok, "^") && len(tok) > 1:
+				suffix := tok[1:]
+				if ct, ok := validCardTypes[suffix]; ok {
+					r.QueryCardType = &ct
+				} else {
+					bodyParts = append(bodyParts, tok)
+				}
+			default:
 				bodyParts = append(bodyParts, tok)
 			}
 		}