Switch reasoning, mode, plan, and fast from the Command Center (#2274)

* Switch reasoning, mode, plan, and fast from the Command Center

Extend the Command Center (Cmd-K) with selectors for a focused agent's
Thinking (reasoning effort), access Mode, Plan mode, and Fast mode,
mirroring the model switcher. Typing surfaces tiered "<Setting> › <Value>"
breadcrumb rows with icons and a check on the current value, for both a
running agent and a new draft tab. Rows only appear while typing, so the
default palette is unchanged.

- Thinking and Mode are multi-option selects; Plan mode and Fast mode are
  On/Off toggles.
- Plan mode is dual-natured: a permission mode for Claude/Copilot/OpenCode
  (excluded from the Mode list, given its own toggle) and the plan_mode
  feature for Codex. Fast mode drives the fast_mode feature (model-gated).
- All logic lives in command-center/agent-setting-contributions.ts as pure,
  unit-tested builders, with a small icon helper and a hook that registers
  the running-agent selectors; the draft registers from its composer tab.
  No changes to the command palette component and no protocol changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* Unify Command Center agent controls

* refactor: clarify agent control ownership

* refactor(app): tighten command center agent controls

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/agent-controls/policy.ts

@@ -0,0 +1,19 @@
+import type { AgentMode } from "@getpaseo/protocol/agent-types";
+
+export const PLAN_MODE_FEATURE_ID = "plan_mode";
+export const FAST_MODE_FEATURE_ID = "fast_mode";
+
+export function isPlanningAgentMode(mode: Pick<AgentMode, "id" | "colorTier">): boolean {
+  return mode.colorTier === "planning" || mode.id === "plan" || mode.id.endsWith("#plan");
+}
+
+export function resolveNonPlanningModeId(
+  modes: readonly AgentMode[],
+  defaultModeId: string | null,
+): string | null {
+  const defaultMode = modes.find((mode) => mode.id === defaultModeId);
+  if (defaultMode && !isPlanningAgentMode(defaultMode)) {
+    return defaultMode.id;
+  }
+  return modes.find((mode) => !isPlanningAgentMode(mode))?.id ?? null;
+}