feat(web): pick a session's agent preset from the composer

A seat in the composer tool row, left of the model select, showing the preset THIS session runs — its own recorded one, not the deployment default, because a resumed session runs what it was created with. `SessionSummary` carries `agentPreset` for that, alongside `cwd` and `origin`. The switch exists only while the conversation has not started. After the first turn the seat becomes a plain label rather than a disabled menu: a greyed control reads as "temporarily unavailable", when in fact the choice is gone for good. The seat never asks in that state, and the host refuses independently with `agent-preset-locked`, so a stale client cannot slip one past it. A rejected switch restores the previous value and surfaces the host's message rather than leaving the seat showing something the session is not running.
2026-08-04 10:54:13 +08:00
parent bf4356cf35
commit a2ab09003f
23 changed files with 430 additions and 11 deletions
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-agent-preset/README.md
-README.md: c22d5a40659bf6300f133ff902fbc3bf8bc75276
-README.zh.md: 6b7e43adcdfe7d6de781511edb5d91a4c45cf11e
+README.md: 322fc7c8ba6eb621f27cb09475079e3d5bccf03f
+README.zh.md: 6eece3248d7f3c3652a30579f907eaf5f888f35f