fix(app): enable debug tools toggle on local channel

[Hona]

Clicking the channel badge in a bun dev desktop build did nothing, so the dev DebugBar (nav/fps/inp/focus toggle) could not be opened.

• packages/desktop/scripts/dev.ts runs the renderer with VITE_OPENCODE_CHANNEL = "local", but ChannelIndicator only wired the debug-tools toggle for "dev". The badge rendered as a plain div.
• Reading props.debugTools from the click handler leaked a createMemo (computations created outside a createRoot ... will never be disposed) because the Solid compiler wraps the conditional prop expression in a memo. The prop is now a plain object with a visible getter.

// titlebar.tsx
const debug = () => (channel === "dev" || channel === "local" ? props.debugTools : undefined)

// shell.tsx
const debugTools = import.meta.env.DEV
  ? { get visible() { return state.debugTools }, toggle: () => setState("debugTools", (v) => !v) }
  : undefined

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