Implement toggle thinking blocks with localStorage persistence

- Add preferences store to manage user preferences in localStorage
- Toggle thinking blocks visibility via command palette (default: hidden)
- Dynamic command label shows current state (Show/Hide Thinking Blocks)
- Filter reasoning parts based on preference in message-stream
- Conditionally render reasoning parts in message-part component
- Support function labels in Command interface for dynamic text

src/stores/preferences.ts

@@ -0,0 +1,45 @@
+import { createSignal } from "solid-js"
+
+const STORAGE_KEY = "opencode-preferences"
+
+interface Preferences {
+  showThinkingBlocks: boolean
+}
+
+const defaultPreferences: Preferences = {
+  showThinkingBlocks: false,
+}
+
+function loadPreferences(): Preferences {
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY)
+    if (stored) {
+      return { ...defaultPreferences, ...JSON.parse(stored) }
+    }
+  } catch (error) {
+    console.error("Failed to load preferences:", error)
+  }
+  return defaultPreferences
+}
+
+function savePreferences(prefs: Preferences): void {
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(prefs))
+  } catch (error) {
+    console.error("Failed to save preferences:", error)
+  }
+}
+
+const [preferences, setPreferences] = createSignal<Preferences>(loadPreferences())
+
+function updatePreferences(updates: Partial<Preferences>): void {
+  const updated = { ...preferences(), ...updates }
+  setPreferences(updated)
+  savePreferences(updated)
+}
+
+function toggleShowThinkingBlocks(): void {
+  updatePreferences({ showThinkingBlocks: !preferences().showThinkingBlocks })
+}
+
+export { preferences, updatePreferences, toggleShowThinkingBlocks }