docs: refresh chat thinking and compaction refs

docs/web/control-ui.md

@@ -83,7 +83,7 @@ The Control UI can localize itself on first load based on your browser locale, a
 - Stream tool calls + live tool output cards in Chat (agent events)
 - Channels: built-in plus bundled/external plugin channels status, QR login, and per-channel config (`channels.status`, `web.login.*`, `config.patch`)
 - Instances: presence list + refresh (`system-presence`)
-- Sessions: list + per-session thinking/fast/verbose/reasoning overrides (`sessions.list`, `sessions.patch`)
+- Sessions: list + per-session model/thinking/fast/verbose/reasoning overrides (`sessions.list`, `sessions.patch`)
 - Cron jobs: list/add/edit/run/enable/disable + run history (`cron.*`)
 - Skills: status, enable/disable, install, API key updates (`skills.*`)
 - Nodes: list + caps (`node.list`)
@@ -117,6 +117,7 @@ Cron jobs panel notes:
 - Re-sending with the same `idempotencyKey` returns `{ status: "in_flight" }` while running, and `{ status: "ok" }` after completion.
 - `chat.history` responses are size-bounded for UI safety. When transcript entries are too large, Gateway may truncate long text fields, omit heavy metadata blocks, and replace oversized messages with a placeholder (`[chat.history omitted: message too large]`).
 - `chat.inject` appends an assistant note to the session transcript and broadcasts a `chat` event for UI-only updates (no agent run, no channel delivery).
+- The chat header model and thinking pickers patch the active session immediately through `sessions.patch`; they are persistent session overrides, not one-turn-only send options.
 - Stop:
   - Click **Stop** (calls `chat.abort`)
   - Type `/stop` (or standalone abort phrases like `stop`, `stop action`, `stop run`, `stop openclaw`, `please stop`) to abort out-of-band