fix toolbar markdown preservation

[ThisIs-Developer]

Summary

• Fixes toolbar formatting actions so markdown source is preserved, rendered, and autosaved correctly.
• Updates the desktop app’s prepared script with the same fix.
• Updates service worker caching so users do not keep running stale toolbar code.

Root Cause

Toolbar actions dispatch plain Event('input') events. These events do not include inputType, but handleKeystrokeHistory() assumed e.inputType was always a string and later called .startsWith(...).

That threw an error before preview rendering and autosave ran. As a result, the editor could show markdown like # Hello, while preview and persisted tab storage stayed on the previous plain-text value.

Validation

• node --check script.js
• node --check desktop-app/resources/js/script.js
• node --check sw.js
• Verified toolbar formatting for headings, bold, italic, lists, tables, code blocks, preview rendering, refresh persistence, and saved markdown preservation.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
markdown-viwer	Ready	Preview, Comment	Jun 3, 2026 8:03pm