Fix GPT-5.5 task recovery and dashboard sessions

[rmacomberGB]

Summary

• preserve streamed OpenAI/Codex text and tool calls when completed output is incomplete
• add a bounded deferred-tool nudge for turns that say they will inspect/edit but emit no tool call
• recover the UI cleanly after Esc cancellation and fix user-message wrapping panics on long whitespace
• include persisted open sessions in dashboard session lists and restore them for whiteboard call-agent requests
• provide a stable daemon subprocess PATH so launchd/systemd-started MCP servers can find node/npx, rg, and fd

Verification

• go test ./cmd/vix -count=1
• go test ./internal/daemon/llm -count=1
• go test ./internal/ui -count=1
• go test ./internal/daemon -run 'Test(ShouldNudgeDeferredToolUse|SessionForWebCall|RunExplorationReturnsConfigErrorWithoutLLM|Sessions(IncludesPersistedOpenRecords|PrefersLiveSessionOverPersistedRecord))' -count=1
• make build
• local smoke check: daemon logs showed rg/fd found and Node-backed MCP servers loading after LaunchAgent PATH refresh
• local smoke check: restored dashboard session /call-agent request successfully read an existing project file