[BUG][Windows] Same workspace appears twice in sidebar (one empty, one populated) due to path variant mismatch

[EgilSandfeld]

Description

Summary

On Windows, a single git worktree can appear twice in OpenCode Web/Desktop sidebar (e.g. feature/loc-turkish), where one entry has sessions and the other shows none.
This appears to happen when the same physical path is represented with different string forms (C:/... vs C:\..., and sometimes drive-case differences), and dedupe/filtering is strict string-based.

Environment

• OpenCode: 1.2.9 and 1.2.10
• OS: Windows
• Web/Desktop UI
• Workspaces enabled

Evidence

• Session rows exist for only one exact directory string (example: C:/Users/.../crisp-planet).
• API/log behavior shows both slash styles being used for same worktree context.
• Sidebar appears to treat these as separate workspaces rather than canonical equivalents.

Expected

• Workspace list dedupes equivalent Windows paths.
• Session filtering canonicalizes directory path before matching.

Actual

• Duplicate workspace rows appear.
• One duplicate row has no sessions.

Suggested fix

• Canonicalize all workspace/session path keys on Windows before:
  • workspace list generation/dedupe
  • session filtering
  • project sandbox/worktree serialization

Plugins

Unrelated

OpenCode version

1.2.10

Steps to reproduce

1. Use repo with workspaces/worktrees enabled.
2. Have a worktree at .../crisp-planet.
3. Open sidebar workspace selector.
4. Observe duplicate entry for same branch/worktree.
5. One entry has sessions; the other entry is empty.

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

No response

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [BUG][Windows][Web/Desktop] Session sidebar uses path-sensitive exact matching (slash + drive-case), causing hidden sessions and duplicate workspaces #14570: Filed by the same author on the same day, describes the same root cause (Windows path variant mismatch causing hidden sessions and duplicate workspace entries in the sidebar — slash style and drive-case sensitivity). The two issues overlap significantly in symptoms, evidence, and suggested fix.
• [Bug] Windows paths with different separators (backslash vs forward slash) treated as different directories in Web UI #12940: Earlier report of Windows path separators (backslash vs forward slash) being treated as different directories in the Web UI, causing duplicate/inaccessible sessions.

Please consider whether #14571 and #14570 can be consolidated into a single issue, or clarify how they differ.