fix(desktop): compaction timeline, tool verbs; remove compaction_token_limit

[wangtsiao]

Summary

• Render Desktop Compacting/Compacted markers inline in the process timeline at chronological arrival order among tools/reasoning, instead of pinning them below turn actions.
• Map native tool names in the Desktop SDK and show progressive verbs (Running, Grepping, Finding, Reading, …) instead of generic tool · Shell/Grep labels.
• Remove the ignored legacy compaction_token_limit config field and all server/CLI/TUI plumbing; limits remain model-derived.

Test plan

• Desktop: mid-turn compaction appears between surrounding tools in the process timeline
• Desktop: Shell/Grep/Glob/Read show Running/Grepping/Finding/Reading while active
• bun test for chat-turn, process-timeline, chat-tool-call, native-client-support
• cargo test -p devo-config --lib;
• cargo test -p devo-server --lib context_occupancy;
• cargo test -p devo-server --test session_compaction_threshold;
• cargo check -p devo-tui -p devo-cli -p devo-server

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