…arch

Port T3 Code upstream commit 66c326b ("Redesign model picker with
favorites and search (pingdotgg#2153)") to MarCode. Replaces the nested Menu
dropdown with a Popover composed of a vertical provider sidebar and
content pane with tokenized fuzzy search, favorites, and keyboard-jump
shortcuts 1-9 (held under the modifier key).

MarCode-specific preservations:
- Claude brand orange (text-[#d97757]) tint on the trigger and sidebar
  icons.
- PROVIDER_OPTIONS keeps claudeAgent first; opencode and cursor remain
  non-selectable "Coming soon" sidebar entries via the new
  pickerSidebarBadge field. AVAILABLE_PROVIDER_OPTIONS filters them out
  of the selectable list; the sidebar still renders them with
  Clock3Icon + tooltip.
- /model slash-command now opens the new picker instead of inserting
  text.
- modelPicker.toggle keybinding clicks the picker trigger via the
  data-chat-provider-model-picker attribute.
- keybindings + terminalOpen props forwarded so jump labels (\u22c31-\u22c39)
  render immediately when the modifier is held.
- @marcode/contracts import path (upstream used @t3tools/contracts).
- Opencode runtime stays deleted (kept coming-soon only in UI).

Regression guards (service.notification-wiring, windowState.integration)
remain green.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

…-picker

# Conflicts:
#	apps/web/src/localApi.test.ts