feat: open local markdown links in file manager

[starSumi]

This adds first-class local-path handling for rendered markdown links without mixing it into the CI baseline work.

What changed

• add a shared local-link resolver in src/path_utils.rs
• support these local target forms:
  • Windows absolute paths like E:\Zero_Base\sumi_os\WSL
  • file:// URLs
  • WSL mount paths like /mnt/e/Zero_Base/sumi_os/WSL
  • relative local targets using current-file and workspace context
• open resolved local targets in the system file manager instead of treating them as browser-only links
• route image local-path resolution through the same resolver
• reuse the same file-manager reveal helper for existing explorer actions

Why

Rendered markdown links currently only open http / https targets. That makes local path links inert even when they point at valid Windows or WSL-backed filesystem locations.

Validation

• git diff --check
• cargo test --locked -j 1 path_utils::tests -- --nocapture

Notes

• Local file targets currently reveal the containing folder in the file manager.
• This PR does not change wikilink navigation semantics.
• This PR does not touch the runtime baseline or packaging baseline follow-up work.

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