Simplify JS code: extract helpers, reduce duplication, streamline callbacks

[dnlvgl]

• Extract CommandRunner._result() to eliminate 4 duplicate result object constructions
• Extract _addEntry() and _addSpin() factory methods in CommandRow to deduplicate UI building
• Simplify stopAll() to iterate timer values directly instead of redundant Map lookups
• Use != null instead of verbose !== null && !== undefined checks
• Use optional chaining for destroy cleanup
• Convert _updateDisplay() imperative loop to .map() with inline empty handling
• Use destructuring in _updateMenu() for cleaner line splitting
• Collapse single-statement arrow function callbacks throughout

https://claude.ai/code/session_01NLVQary3Fn5aKVWzqMUkL9

Summary by CodeRabbit

Release Notes

• Refactor

  • Improved internal code structure and consistency across command handling and UI construction.
  • Consolidated duplicate UI component creation logic for streamlined maintenance.
  • Enhanced code organization with standardized helper methods for better consistency.

• Chores

  • Internal code cleanup and simplification with no changes to user-facing functionality.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request consolidates command result handling and UI construction across two files. A new static helper method standardizes result objects in extension.js, replacing inline object creation. Reusable UI builder helpers are introduced in prefs.js to reduce duplication in row construction and event wiring.

Changes

Cohort / File(s)	Summary
Command Result Standardization extension.js	Added CommandRunner._result() static helper to normalize result objects. Replaced scattered inline result object definitions with calls to this helper across timeout, success, error, and exception handling paths. Minor strictness adjustments to null checks for timer and cleanup logic.
UI Builder Consolidation prefs.js	Introduced private helper methods _addEntry() and _addSpin() in CommandRow to encapsulate row construction and event wiring. Refactored _buildUI() to use these helpers instead of ad-hoc row creation, reducing duplication while maintaining state synchronization and update triggers.
UI Wiring Updates extension.js	Updated signal connections and menu item rendering to use concise callback syntax. Consolidated formatting logic for handling empty, error, and truncated outputs in menu items.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Hopping through code, I see the refrain,
Helpers and standards, a cleaner domain!
Results now bundled, UI rows reuse,
Duplication bid adieu—hooray, no more blues! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: extracting helper methods, reducing code duplication, and streamlining callbacks—all core refactoring objectives visible in both files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/simplify-js-code-T21zN

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