[rotespferd]

Closes #4

Summary

 src/blocks/
 ├── registry.ts              # + 'body-text'
+├── body-text-format.ts      # own format <-> Tiptap doc (ADR-0002)
+├── body-text.tsx            # Block Type: View + Properties Panel buttons
 └── heading.tsx

Body Text data = { paragraphs: TextRun[][] }
TextRun        = { text, bold, italic, underline }   # "\n" = line break (Shift+Enter)

BodyTextView (Tiptap: paragraphs, line breaks, bold/italic/underline only)
  onUpdate -> fromTiptapDoc -> onChange        # no Tiptap structures stored
  focus / click -> activeEditor
BodyTextProperties (Bold / Italic / Underline)
  reads activeEditor -> toggles marks on the text selection

Block Palette, Worksheet view and Properties Panel are unchanged. Palette entries also get 8px spacing.

Evidence

• Before: no Body Text Block Type; 34 tests.
  After: 44 tests, pnpm typecheck and pnpm lint clean:

convert(paragraphs) -> tiptap -> convert back == original   # text, each mark, combined, multi-paragraph, empty, line break
adjacent runs with same formatting             -> merged
Ctrl+B/I/U                                     -> button aria-pressed = true
select text, click Bold/Italic/Underline       -> stored runs carry the flag, only our keys
click Block B after Block A                    -> buttons follow Block B
paste <ul>, <a>, color, text-align             -> dropped by schema

Real Enter/paste events and Cmd shortcuts on macOS are not covered by automated tests; checked manually in the app.

Merge Danger

Door: two-way

Blast Radius: contained

Adds Tiptap dependencies. A line break is stored as \n in run text, so the future PDF renderer must honour it (not covered by ADR-0002 yet).

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