Card body shows wrong TOC

# Env
- OS: MacOS Sequoia 15.6 (Apple M2)
- App: Desktop Application
- Plugin Config: default (not sure. see screenshot below)

# How to reproduce
- Create kanban
- Create 2 cards at kanban board by using `Create note from card`
- write [TOC] with headings in both of two
- boom!

# screenshots

Start by reproducing the issue in the desktop application: create a kanban, make two cards with “Create note from card,” and add headings with [TOC] to both notes. Trace how each card’s body and table of contents are associated, then verify that each card displays the TOC for its own note rather than the other card’s headings.

Written by the indexing model from the issue text.