fix(grid): add box-drawing characters to FILE_LINK_SEPARATORS

[rndjams]

Description

Adds Unicode box-drawing characters (single and double-line variants) to FILE_LINK_SEPARATORS so that tree, eza --tree, and lsd --tree output filenames are tokenized as standalone clickable candidates.

Previously, rows like │ └── alpha.md were treated as a single token because │, ├, └, ─ were not in the separator set, making filenames in tree output never clickable.

Characters added:

• Single-line: │ ├ └ ─ ┬ ┴ ┼ ┌ ┐ ┘
• Double-line: ║ ╠ ╚ ═ ╦ ╩ ╬ ╔ ╗ ╝

Linked Issue

Closes #9909

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

• 3 new unit tests in grid_handler_test.rs:
  • test_box_drawing_chars_are_link_separators — │ └── alpha.md produces alpha.md as candidate
  • test_box_drawing_tree_branch_with_directory — ├── src produces src as candidate
  • test_double_line_box_drawing_separators — ║ ╚══ notes.txt produces notes.txt as candidate
• cargo fmt -- --check — clean.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-BUG-FIX: Fixed tree output filenames not being clickable due to box-drawing characters not being recognized as link separators.

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@rndjams

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Overview

This PR adds box-drawing characters to FILE_LINK_SEPARATORS so tree-style terminal output can produce standalone clickable file path candidates, and includes focused unit coverage for single-line and double-line tree prefixes.

Concerns

• No blocking correctness or security concerns found in the changed lines.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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