feat(settings): a Pet page for the mascot

Settings -> Pet (/settings/pet, PetSettings.tsx): show/hide, speech
bubbles, size with a live preview, and the pet grid - Sagi, featured
codex-pets.net pets (downloaded on first pick), your own (deletable) -
with image upload and .codex-pet.zip import. The Sagi block leaves
General; the mascot menu's Pet settings opens the page. PetMenu and the
page share components/Sagi/usePets.ts.

client/src/lib/settingsSearch.ts

@@ -34,7 +34,15 @@ export const SETTINGS_INDEX: {
   { section: "general", titleKey: "lanesSection.runHousekeeping" },
   { section: "general", titleKey: "import.title", keywords: ["history", "transcripts"] },
   { section: "general", titleKey: "remoteSources.title", keywords: ["ssh", "machines"] },
-  { section: "general", titleKey: "sagi.title", descKey: "sagi.description" },
+  {
+    section: "pet",
+    titleKey: "sagi.title",
+    descKey: "sagi.description",
+    keywords: ["sagi", "mascot", "pet"],
+  },
+  { section: "pet", titleKey: "sagi.bubbles", descKey: "sagi.bubblesDesc" },
+  { section: "pet", titleKey: "sagi.pet.size" },
+  { section: "pet", titleKey: "sagi.pet.choose", keywords: ["codex-pets", "upload", "import"] },
   { section: "general", titleKey: "data.title", descKey: "data.description" },
   { section: "general", titleKey: "danger.title", keywords: ["clear", "delete", "export"] },
   { section: "general", titleKey: "about.title", keywords: ["version", "server", "database"] },