Fix archived-only project deletion (superseded)

[SAKETH11111]

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.

Validation

• bun fmt
• bun lint
• bun typecheck
• bun run --cwd apps/web test -- src/components/Sidebar.logic.test.ts
• bun run --cwd apps/server test -- src/provider/Layers/ClaudeAdapter.test.ts
• git diff --check

Note

Fix project deletion check 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.
• Fixes a bug in Sidebar.tsx where deleting a project with only archived threads was incorrectly blocked; the deletion guard now uses getSidebarThreadsByIds which excludes archived threads from the active thread count.
• Also extends Claude adapter in ClaudeAdapter.ts to handle server_tool_use and mcp_tool_use content blocks alongside tool_use, validated via a new getClaudeToolStartBlock helper.

^{Macroscope summarized 7d3763d.}

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[SAKETH11111]

Closing and replacing this PR because the branch/title naming needed cleanup.