feat(app): add dropped file tab option

[murongg]

Summary

• add an opt-in General setting to open dropped Markdown files as tabs in the current window
• preserve the current workspace tree when a dropped file replaces an empty tab, and reuse that tab instead of leaving a blank one behind
• open dropped folders in a new window whenever another tab contains work, preventing hidden tabs from being cleared
• keep the existing new-window default for dropped files
• persist and normalize the preference, with translations for all 11 supported languages

Why

Opening a file currently establishes its containing folder as a workspace, so the new-window behavior is intentional. This option supports the requested tab workflow without changing the default workspace model or discarding existing tab state.

Validation

• pnpm --filter @markra/shared test — 7 test files and 62 tests passed
• pnpm --filter @markra/shared build — passed
• pnpm --filter @markra/app exec vitest run src/hooks/useMarkdownDocument.test.tsx — 82 tests passed
• pnpm --filter @markra/app typecheck:test — passed
• pnpm --filter @markra/app test — 127 test files and 1445 tests passed
• pnpm --filter @markra/desktop build — production build and 15 vendor chunk imports passed
• verified all 3 new i18n keys are present in 11/11 locale files

Risk

• the tab behavior only activates when both the new preference and document tabs are enabled; otherwise Markra keeps the existing new-window behavior
• a fresh empty window still establishes a workspace from its first dropped file
• a dropped folder reuses the current window only when every open tab is empty
• existing settings require no migration because missing values normalize to false

Closes #576

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jul 26, 2026 1:25pm