feat(core): add markdown preview for backlinks

[EYHN]

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[EYHN]

• test(core): a simple e2e case for linked doc preview #8957
• feat: enhance markdown preview for backlinks #8956
• feat(core): add markdown preview for backlinks #8883 👈 (View in Graphite)
• canary

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.68%. Comparing base (b60f246) to head (449a27e).

Files with missing lines	Patch %	Lines
packages/common/infra/src/sync/indexer/document.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #8883      +/-   ##
==========================================
- Coverage   65.34%   64.68%   -0.66%     
==========================================
  Files         664      664              
  Lines       37343    37343              
  Branches     3653     3610      -43     
==========================================
- Hits        24400    24157     -243     
- Misses      12573    12819     +246     
+ Partials      370      367       -3     

Flag	Coverage Δ
server-test	77.07% <ø> (-0.84%)	⬇️
unittest	34.58% <0.00%> (ø)

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