feat(tui): always-visible capture bar with focus cycling

Replace drawer-based input with permanent capture bar at bottom.
Focus defaults to capture on startup — open nib, start typing.

- Remove stateInput; route via focusCapture/focusList/focusDetail
- Tab cycles: capture → list → detail (split) → capture
- Esc cascades: clear search → clear filter → focus capture
- Capture bar shows blinking cursor when focused, dims when not
- Intent cycling moved from tab to i (tab now cycles focus)
- Parse preview shown inline in status bar while typing
- Content area constant height (no layout thrash from drawer)

internal/tui/statusbar.go

@@ -30,12 +30,10 @@ func renderTab(label, key string, active bool) string {
 func renderStatusBar(m model, width int) string {
 	var leftParts []string
 
-	if m.state == stateList {
-		leftParts = append(leftParts, renderTab("capture", "a", false))
-	}
-
 	if m.status != "" {
 		leftParts = append(leftParts, statusStyle.Render(m.status))
+	} else if preview := m.input.previewText(); m.focus == focusCapture && preview != "" {
+		leftParts = append(leftParts, drawerPreviewStyle.Render(preview))
 	} else {
 		leftParts = append(leftParts, statusStyle.Render(countText(m)))
 	}
@@ -76,8 +74,6 @@ func contextHints(m model) []hint {
 		default:
 			return []hint{{"p", "promote"}, {"D", "demote"}, {"c", "copy"}, {"e", "edit"}, {"r", "run"}, {"f", "fill"}, {"!", "pin"}, {"esc", "back"}}
 		}
-	case stateInput:
-		return nil
 	case stateTagFilter:
 		return []hint{{"j/k", "nav"}, {"enter", "select"}, {"esc", "cancel"}}
 	case stateConfirm:
@@ -86,16 +82,23 @@ func contextHints(m model) []hint {
 		return []hint{{"j/k", "nav"}, {"enter", "select"}, {"esc", "cancel"}}
 	case stateAbsorb:
 		return []hint{{"j/k", "nav"}, {"enter", "absorb"}, {"esc", "cancel"}}
+	}
+
+	switch m.focus {
+	case focusCapture:
+		return []hint{{"enter", "submit"}, {"esc", "browse"}, {"?…", "search"}, {"-", "todo"}, {"@", "event"}}
+	case focusDetail:
+		if m.splitDetail {
+			return []hint{{"h", "list"}, {"c", "copy"}, {"e", "edit"}, {"p", "promote"}, {"!", "pin"}, {"tab", "capture"}}
+		}
+		return []hint{{"c", "copy"}, {"e", "edit"}, {"p", "promote"}, {"!", "pin"}, {"esc", "back"}}
 	default:
 		if m.splitDetail {
-			if m.focus == focusDetail {
-				return []hint{{"h", "list"}, {"c", "copy"}, {"e", "edit"}, {"p", "promote"}, {"D", "demote"}, {"!", "pin"}, {"esc", "back"}}
-			}
-			return []hint{{"l", "detail"}, {"d", "del"}, {"#", "filter"}, {"esc", "close"}, {"?", "help"}, {"q", "quit"}}
+			return []hint{{"l", "detail"}, {"d", "del"}, {"#", "filter"}, {"tab", "capture"}, {"?", "help"}}
 		}
 		if m.mode == modeCards {
-			return []hint{{"s", "sort"}, {"tab", "intent"}, {"?", "help"}, {"q", "quit"}}
+			return []hint{{"s", "sort"}, {"i", "intent"}, {"tab", "capture"}, {"?", "help"}}
 		}
-		return []hint{{"?", "search"}, {"m", "absorb"}, {"d", "del"}, {"#", "filter"}, {"?", "help"}, {"q", "quit"}}
+		return []hint{{"m", "absorb"}, {"d", "del"}, {"#", "filter"}, {"tab", "capture"}, {"?", "help"}}
 	}
 }