fix(edgeless): mindmap layout for existing model

[doodlewind]

This fixed the bug that for existing model inside Y.Doc (instead of the ones added by calling surface.addElement), the layout reactivity was lost.

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[github-actions]

size-limit report 📦

Path	Size
@blocksuite/affine	13 B (0%)
@blocksuite/affine/effects	2.03 MB (-0.01% 🔽)
@blocksuite/affine/block-std	144.92 KB (0%)
@blocksuite/affine/block-std/gfx	75.93 KB (0%)
@blocksuite/affine/global	13 B (0%)
@blocksuite/affine/global/utils	13.82 KB (0%)
@blocksuite/affine/global/env	231 B (0%)
@blocksuite/affine/global/exceptions	552 B (0%)
@blocksuite/affine/global/di	1.65 KB (0%)
@blocksuite/affine/global/types	13 B (0%)
@blocksuite/affine/store	69.09 KB (0%)
@blocksuite/affine/inline	30.45 KB (0%)
@blocksuite/affine/inline/consts	51 B (0%)
@blocksuite/affine/inline/types	13 B (0%)
@blocksuite/affine/presets	1.83 MB (-0.02% 🔽)
@blocksuite/affine/blocks	1.92 MB (+0.01% 🔺)
@blocksuite/affine/blocks/schemas	85.48 KB (+2.14% 🔺)