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/i18n/resources/en.ts

@@ -62,6 +62,16 @@ export const en = {
       home: "Home",
       modelGroupLabel: "Model",
       modelSearchKeywords: "switch model change model set model select model",
+      thinkingGroupLabel: "Thinking",
+      thinkingSearchKeywords: "reasoning effort thinking think",
+      modeGroupLabel: "Mode",
+      modeSearchKeywords: "access permission approval mode",
+      planModeGroupLabel: "Plan mode",
+      planModeSearchKeywords: "plan planning plan mode",
+      fastModeGroupLabel: "Fast",
+      fastModeSearchKeywords: "fast speed low latency",
+      settingOn: "On",
+      settingOff: "Off",
     },
   },
   composer: {