[codex] Fix Markdown default app registration

[samuelstroschein]

Summary

Fix macOS Markdown default-app registration so Flashtype does not let old DMGs or local release builds compete with the installed app.

• only the canonical /Applications/Flashtype.app may register Markdown defaults
• preserve third-party Markdown handlers like VS Code or Obsidian
• replace missing handlers, Xcode, or Flashtype itself
• unregister stale noncanonical com.flashtype.app registrations before refreshing the installed app
• lower the passive document handler rank from Owner to Alternate

Root Cause

LaunchServices stores default document handlers by bundle id, not by app path. Multiple Flashtype bundles used com.flashtype.app and claimed Markdown ownership, so macOS could resolve .md opens to an old mounted DMG or local release build instead of the installed 0.2.x app.

Validation

• pnpm vitest run electron/markdown-default-handler.test.ts
• pnpm oxlint --tsconfig ./tsconfig.json --ignore-path .gitignore electron/main.mjs electron/markdown-default-handler.mjs electron/markdown-default-handler.test.ts
• pnpm typecheck
• git diff --check

---

Note

Medium Risk
Startup code mutates system LaunchServices defaults and unregisters bundles; mistakes could affect which app opens Markdown or leave stale registrations, though scope is limited to darwin packaged installs and replaceable handlers.

Overview
Fixes macOS Markdown default-app behavior so multiple com.flashtype.app bundles (DMGs, local builds) no longer steal .md opens from the installed app.

Markdown registration moves from inline logic in electron/main.mjs into electron/markdown-default-handler.mjs. On startup, only /Applications/Flashtype.app may register defaults: it unregisters stale non-canonical Flashtype bundles via lsregister, refreshes the canonical bundle, reads current editor handlers, and calls LSSetDefaultRoleHandlerForContentType only for content types whose current handler is missing, Xcode, TextEdit, or Flashtype—third-party choices (e.g. VS Code, Obsidian) are left alone. Packaged electron-builder.yml changes Markdown document LSHandlerRank from Owner to Alternate. Vitest coverage documents the policy and full workflow.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	flashtype-website	7e1255c	Commit Preview URL Branch Preview URL	Jun 17 2026, 06:56 PM

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Treat TextEdit fallback as replaceable

When the existing Markdown default is macOS's TextEdit fallback (com.apple.TextEdit), this replacement allowlist treats it like a user-selected third-party Markdown editor, so getMarkdownContentTypesToRegister() returns nothing and the packaged /Applications/Flashtype.app never becomes the default. That regresses the previous first-run registration path for users whose .md files still open in TextEdit, while the preservation logic was meant for explicit third-party handlers such as VS Code or Obsidian.

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