Cherry-pick from upstream

Upstream commit: de2ccffec
Author: Peter Steinberger steipete@gmail.com

fix(ui): stream tool events live in control chat (openclaw#39104)

Depends on #1747

Conflict resolution:

• CHANGELOG.md: union merge (both-added non-overlapping entries)
• app-gateway.ts: composed fork's thinking injection + upstream's hadToolEvents tracking; preserved fork's early-return pattern with hadToolEvents check in both exit paths; applied RemoteClawApp rebrand to new loadChatHistory calls
• app-render.ts, app.ts, views/chat.ts, app-tool-stream.ts: both-added independent properties (fork's thinkingStream + upstream's streamSegments)
• controllers/chat.ts: kept fork's removal of chatThinkingLevel, added upstream's stream clearing on history load