Fix terminal suggestions showing local paths in remote SSH terminals

[Copilot]

Description

Terminal path suggestions were incorrectly resolving against the local filesystem when connected via Remote SSH. Typing cd / in a Linux remote terminal would suggest Windows host directories (/Program Files/, /Windows/) instead of remote directories.

The issue occurred because path resolution used URI.file(), which always creates local file:// URIs, ignoring the remote scheme in the terminal's cwd URI (e.g., vscode-remote://ssh-remote+hostname/path).

Changes

Changed all path resolution to use cwd.with({ path }) instead of URI.file(), preserving the URI scheme and authority:

• Absolute paths: /foo now resolves with remote scheme when cwd is remote
• Tilde paths: ~/ now resolves to remote home directory
• CDPATH entries: Now resolve against remote filesystem
• Tilde completion detail: Simplified to avoid unnecessary path operations

Added test coverage for remote SSH URI schemes in both absolute and tilde path scenarios.

Example

Before:

// Always creates local URI regardless of remote context
lastWordFolderResource = URI.file('/foo');
// → file:///foo (wrong when remote)

After:

// Preserves scheme/authority from cwd
lastWordFolderResource = cwd.with({ path: '/foo' });
// → vscode-remote://ssh-remote+hostname/foo (correct)

Original prompt

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This section details on the original issue you should resolve

<issue_title>terminal.integrated.suggest with Remote - SSH suggests host directories</issue_title>
<issue_description>Type: Bug

Connecting to a Linux remote from a Windows host with terminal.integrated.suggest enabled.

When typing cd / in the Linux terminal, it suggests directories from my Windows host instead of the Linux remote:

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VS Code version: Code - Insiders 1.101.0-insider (9bb394b, 2025-05-27T06:34:19.809Z)
OS version: Windows_NT x64 10.0.26100
Modes:
Remote OS version: Linux x64 5.15.167.4-microsoft-standard-WSL2</issue_description>

Comments on the Issue (you are @copilot in this section)

@meganrogge Is this still happening for you?

• Fixes terminal.integrated.suggest with Remote - SSH suggests host directories #249896

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