feat(editor): strike tasks, link tips, fence copy

[tomymaritano]

Summary

• Strike through checked GFM tasks in the source editor (and preview).
• Show the destination URL when hovering a markdown/autolink.
• Copy button on fenced blocks when the cursor is inside (preview on hover too).

Inkdrop v6 ships these three in the editor; they were the leftover source-mode gaps after line commands (#524).

Test plan

• pnpm --filter @dripnex/commands test
• pnpm --filter @dripnex/desktop exec vitest run src/renderer/utils/__tests__/splitCodeLines.test.ts
• pnpm --filter @dripnex/commands typecheck + desktop renderer typecheck
• In the editor: - [x] done strikes the text; - [ ] does not
• Hover [label](https://dripnex.app) — tooltip shows the URL
• Place the cursor inside a ``` fence — Copy appears and copies the inner source
• Preview: hover a code block, Copy works; checked task items are struck

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Run ID: 95be6542-7d99-4c4b-b1b6-38a2f5442acb

📥 Commits

Reviewing files that changed from the base of the PR and between 2865017 and dee6e5d.

📒 Files selected for processing (10)

• apps/desktop/src/renderer/components/MarkdownEditor.tsx
• apps/desktop/src/renderer/components/editor/FenceBlock.tsx
• apps/desktop/src/renderer/components/editor/MarkdownPreview.module.css
• apps/desktop/src/renderer/components/editorTheme.ts
• apps/desktop/src/renderer/editor/editorPolish.ts
• apps/desktop/src/renderer/utils/__tests__/splitCodeLines.test.ts
• apps/desktop/src/renderer/utils/splitCodeLines.ts
• packages/commands/src/index.ts
• packages/commands/src/markdown/editorPolish.test.ts
• packages/commands/src/markdown/editorPolish.ts

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