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/tui/input.go

@@ -11,10 +11,13 @@ import (
 )
 
 type inputResult struct {
-	entity *db.Entity
-	query  bool
-	body   string
-	tags   []string
+	entity   *db.Entity
+	query    bool
+	body     string
+	tags     []string
+	dateFrom *string
+	dateTo   *string
+	cardType *db.CardType
 }
 
 type inputModel struct {
@@ -47,11 +50,18 @@ func (i inputModel) submit() *inputResult {
 	}
 
 	if parsed.Query {
-		return &inputResult{
-			query: true,
-			body:  parsed.Body,
-			tags:  parsed.FilterTags,
+		r := &inputResult{
+			query:    true,
+			body:     parsed.Body,
+			tags:     parsed.FilterTags,
+			dateFrom: parsed.QueryDateFrom,
+			dateTo:   parsed.QueryDateTo,
 		}
+		if parsed.QueryCardType != nil {
+			ct := db.CardType(*parsed.QueryCardType)
+			r.cardType = &ct
+		}
+		return r
 	}
 
 	e := &db.Entity{
@@ -120,6 +130,15 @@ func (i inputModel) previewText() string {
 		for _, t := range p.FilterTags {
 			q += " #" + t
 		}
+		if p.QueryDateFrom != nil {
+			q += " from:" + *p.QueryDateFrom
+		}
+		if p.QueryDateTo != nil {
+			q += " to:" + *p.QueryDateTo
+		}
+		if p.QueryCardType != nil {
+			q += " ^" + *p.QueryCardType
+		}
 		return "search: " + q
 	}