Salvaged and rebased from #66354 by @UnathiCodex onto current main.
Fixes a fresh-chat race in Hermes Desktop where a model, reasoning-effort,
or Fast selection made before the first Send could be replaced by an
in-flight profile refresh, or read only after the profile handshake
yielded. Send is now the linearization point: the visible selector state is
snapshotted before awaiting profile readiness, and intent-generation guards
make older config/model responses stand down after a picker/toggle action.
Adds the contract-v4 session-create wire contract for explicit Fast=false.
Conflict resolution vs the original branch (use-model-controls.ts / .test.tsx):
combined main's catalog-aware keepManualPick() sticky-pick logic with the
PR's profileRefreshEpoch + composerSelectionGeneration staleness guards so
both a removed-from-catalog reseed and the in-flight-picker race are handled.
Verified on current main: apps/desktop tsc --noEmit clean; 80 affected
UI/store tests pass (use-model-controls, use-hermes-config,
use-session-actions, model-edit-submenu, model-presets, updates).
Co-authored-by: UnathiCodex <theunathi@gmail.com>
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