feat(tui): add split-pane detail, compact date headers, and input drawer

Three layout improvements for better space utilization:

- Compact date headers: date labels render as left gutter column instead
  of standalone lines, saving one line per date group in stream view
- Input drawer: capture bar expands to 4-line drawer with border, hints,
  and live preview of parsed entity/search query
- Split-pane detail: wide terminals (>=100 cols) show list and detail
  side-by-side with h/l focus switching, falling back to full-screen
  detail on narrow terminals

internal/tui/input.go

@@ -1,6 +1,9 @@
 package tui
 
 import (
+	"fmt"
+	"strings"
+
 	"github.com/charmbracelet/bubbles/textinput"
 	tea "github.com/charmbracelet/bubbletea"
 
@@ -16,8 +19,9 @@ type inputResult struct {
 }
 
 type inputModel struct {
-	ti     textinput.Model
-	active bool
+	ti      textinput.Model
+	active  bool
+	preview *parse.Result
 }
 
 func newInputModel() inputModel {
@@ -37,6 +41,7 @@ func (i *inputModel) reset() {
 	i.active = false
 	i.ti.SetValue("")
 	i.ti.Blur()
+	i.preview = nil
 }
 
 func (i inputModel) submit() *inputResult {
@@ -83,9 +88,103 @@ func (i inputModel) submit() *inputResult {
 
 func (i inputModel) updateKey(msg tea.KeyMsg) inputModel {
 	i.ti, _ = i.ti.Update(msg)
+	val := i.ti.Value()
+	if val != "" {
+		parsed, err := parse.Parse(val)
+		if err == nil {
+			i.preview = parsed
+		} else {
+			i.preview = nil
+		}
+	} else {
+		i.preview = nil
+	}
 	return i
 }
 
 func (i inputModel) view(width int) string {
-	return i.ti.View()
+	var b strings.Builder
+	b.WriteString(drawerBorderStyle.Render(strings.Repeat("─", width)))
+	b.WriteString("\n")
+	b.WriteString(i.ti.View())
+	b.WriteString("\n")
+	b.WriteString(drawerHintsStyle.Render("enter:submit  esc:cancel  ?:search  -:todo  @:event  !:reminder"))
+	b.WriteString("\n")
+	b.WriteString(i.renderPreview(width))
+	return b.String()
+}
+
+func (i inputModel) renderPreview(width int) string {
+	if i.preview == nil {
+		return drawerPreviewStyle.Render("")
+	}
+
+	p := i.preview
+
+	if p.Query {
+		q := "?"
+		if p.Body != "" {
+			q += p.Body
+		}
+		for _, t := range p.FilterTags {
+			q += " #" + t
+		}
+		return drawerPreviewStyle.Render("search: " + q)
+	}
+
+	glyph := glyphForParsed(p.Glyph)
+	body := p.Body
+	if p.Title != nil {
+		body = *p.Title
+	}
+
+	var parts []string
+	parts = append(parts, glyph, body)
+	for _, t := range p.Tags {
+		parts = append(parts, tagStyle.Render("#"+t))
+	}
+	if p.Pin {
+		parts = append(parts, pinnedStyle.Render("•"))
+	}
+	if p.CardSuffix != nil {
+		parts = append(parts, affordanceStyle.Render(*p.CardSuffix))
+	}
+
+	line := strings.Join(parts, " ")
+	maxW := width - 4
+	if maxW > 0 && len(stripAnsi(line)) > maxW {
+		line = truncate(line, maxW)
+	}
+
+	return drawerPreviewStyle.Render(line)
+}
+
+func glyphForParsed(glyph string) string {
+	switch glyph {
+	case "todo":
+		return "○"
+	case "event":
+		return "◇"
+	case "reminder":
+		return "△"
+	default:
+		return "—"
+	}
+}
+
+func drawerLines() int {
+	return 3
+}
+
+// formatPreviewEntity builds a preview string showing how the entity will appear
+func formatPreviewEntity(p *parse.Result) string {
+	if p == nil {
+		return ""
+	}
+	glyph := glyphForParsed(p.Glyph)
+	body := p.Body
+	if p.Title != nil {
+		body = *p.Title
+	}
+	return fmt.Sprintf("%s %s", glyph, body)
 }