feat(editor): indent lists by the marker above

[tomymaritano]

Why

Tab always indented by two spaces. That nests a bullet under -, but not under 1. (needs 3) or 10. (needs 4). Inkdrop v6.1 fixed this last week; we still had indentWithTab.

What

• Tab / Shift-Tab indent a list item by the marker width of the item above (- → 2, 1. → 3, 10. → 4). Descendants move with the parent.
• Numbered lists in the same region are renumbered in the same undo step.
• List markers in the editor are colored by nesting level (--md-list-mark-color, --md-list-mark-2-color, --md-list-mark-3-color). Deeper levels cycle. Preview markers stay text-colored unless a theme opts into --mde-preview-list-marker-*.
• Tables still own Tab inside a cell (plugin keymap is later). Plain lines still fall through to indentWithTab.

Independent of #522.

Test plan

• In a note: 1. parent then - child. Tab on the bullet — it should sit three spaces in and render nested.
• Shift-Tab lifts it back. One undo reverts both the indent and any renumber.
• 1. a / 2. b / 3. c — Tab on 2. → nested 1. b, outer 2. c.
• Nested bullets get a second/third marker color in the editor.
• Tab inside a table cell still moves between cells.
• Tab on a non-list line still indents by tab size.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 73f1078 and 068ec3f.

📒 Files selected for processing (11)

• apps/desktop/src/renderer/components/MarkdownEditor.tsx
• apps/desktop/src/renderer/components/editor/MarkdownPreview.module.css
• apps/desktop/src/renderer/components/editor/__tests__/listMarkDecorations.test.ts
• apps/desktop/src/renderer/components/editor/listMarkDecorations.ts
• apps/desktop/src/renderer/components/editorTheme.ts
• apps/desktop/src/renderer/ui/tokens/tokens.css
• packages/commands/src/index.ts
• packages/commands/src/markdown/listIndent.test.ts
• packages/commands/src/markdown/listIndent.ts
• packages/plugin-api/src/theme/themeTypes.ts
• packages/plugin-api/tests/themeTypes.test.ts

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