feat(app): default new-session directory to workspace folder (#872)

[jeonghun-jj-lee]

Closes #872

Problem

New sessions default their directory to the engine scaffold dir, not a VS Code workspace folder. The sidebar's orphan guard rejects this path, so #841 expand/scroll silently fails.

Fix

Two code paths create drafts — draftDirectory() in tabs.tsx and the navigate bridge in app.tsx. Both now check workspaceProjects() first (the extension's real VS Code folder list) before falling back to server.projects.list() (the engine's scaffold dir).

This is a fork change synced via overlay:

• Fork PR: feat(app): default draft directory to workspace folder (amicode#872) opencode#308
• 7 new tests in amicode-workspace-projects.test.ts

Changes

File	What
app.tsx:482-489	Navigate bridge prefers workspaceProjects() for /new-session drafts
tabs.tsx:64-70	draftDirectory() prefers workspaceProjects() over server.projects.list()
amicode-workspace-projects.test.ts	7 new source-pattern tests: preference, fallback, override
manifest.json	Hash updates for the 3 overlay files

Test results

• Fork: 1077 unit + 41 browser = 0 failures
• Extension: 2794 passed, 0 failures

AC checklist

• New session directory is a workspace folder when workspace-projects available
• Sidebar expands/scrolls on new session (end-to-end with fix: workspace-projects bridge message lost — project selector falls back to stock opencode #871)
• Sidebar expands/scrolls correctly on tab switch
• Explicit dropdown selection still overrides the default
• Graceful fallback when workspace-projects haven't arrived yet

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