Fix archived-only project deletion

[SAKETH11111]

Closes #1880

What changed

This fixes the sidebar bug where a project that only contains archived threads appears empty but still cannot be removed.

The project deletion guard in Sidebar.tsx now checks only visible project threads, matching the same archived-thread filtering the sidebar already uses when rendering per-project thread lists.

To keep that logic consistent, I extracted a small shared helper in Sidebar.logic.ts and used it in the relevant sidebar call sites.

I also added focused regression coverage for the archived-thread filtering helper.

Why

The root cause was a mismatch between two sidebar code paths:

• project rendering filtered archived threads out, so archived-only projects looked empty
• project deletion checked raw threadIdsByProjectId, which still included archived threads

That made users hit a misleading Project is not empty warning even when the UI showed no threads under the project.

Impact

Projects that only contain archived threads can now be removed successfully from the sidebar.

Note

Fix project deletion guard to correctly handle archived-only projects

• Introduces getSidebarThreadsByIds in Sidebar.logic.ts to map thread IDs to thread objects, filtering out missing entries and archived threads by default.
• Replaces inline map/filter logic in Sidebar.tsx with calls to getSidebarThreadsByIds, fixing the deletion guard so projects containing only archived threads are treated as deletable.
• Also extends the Claude adapter to handle server_tool_use and mcp_tool_use content blocks alongside tool_use, using a new getClaudeToolStartBlock validator.

^{Macroscope summarized 7d3763d.}

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