feat: Claude Code figures, effort indicators, UI constants

- Added theme/figures.go with all Claude Code UI symbols
  (⏺ ○ ◐ ● ◉ ↑ ↓ ↯ ✓ ✗ ⎿ ▎ etc.)
- Effort level icons for status bar
- 6650+ lines Go

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: idoubi

internal/theme/figures.go

@@ -0,0 +1,40 @@
+package theme
+
+import "runtime"
+
+// UI figures matching Claude Code's visual style
+var (
+	// Status indicators
+	BlackCircle = func() string {
+		if runtime.GOOS == "darwin" {
+			return "⏺"
+		}
+		return "●"
+	}()
+	BulletOp      = "∙"
+	UpArrow       = "↑"
+	DownArrow     = "↓"
+	LightningBolt = "↯"
+
+	// Effort indicators
+	EffortLow    = "○"
+	EffortMedium = "◐"
+	EffortHigh   = "●"
+	EffortMax    = "◉"
+
+	// Media
+	PlayIcon  = "▶"
+	PauseIcon = "⏸"
+
+	// Status
+	RefreshArrow = "↻"
+	DiamondOpen  = "◇"
+	DiamondFull  = "◆"
+	FlagIcon     = "⚑"
+	BlockquoteBar = "▎"
+
+	// Checkmarks
+	CheckMark = "✓"
+	CrossMark = "✗"
+	TreeConn  = "⎿"
+)