feat: Slice 1 polish - MiMo V2.5 model, visible reasoning, image attachments, mobile keyboard fix

- Switch conversation agent to xiaomi/mimo-v2.5 (multimodal: text + image)
- Render native reasoning parts as live 'Thinking trace' (streaming open,
  collapsed after completion); inline <think> extraction for streaming models
- Image attachments: picker (up to 4, 10MB each), base64 to Flue
  AgentPromptImage, authenticated blob-URL replay for historical images
- Mobile keyboard viewport fix: visual-viewport hook, fixed shell,
  interactive-widget=resizes-content, header pinned, composer follows keyboard
- Conversation to Signal to proposed Work: Convex persistence, Effect
  validation in @code/work-os, Work cards with exact source provenance
- Streamdown markdown + Mermaid chart rendering in chat messages
- Flue tool turns hidden, reasoning-containing turns remain visible
- Frontend regression tests: keyboard viewport, responsive shell,
  attachment overflow, authenticated images, reasoning traces, transforms
- .env.example updated to xiaomi/mimo-v2.5 config

vite.config.ts

@@ -1,10 +1,37 @@
 import { defineConfig } from "vite-plus";
 
 export default defineConfig({
+  fmt: {
+    ignorePatterns: [
+      "node_modules/**",
+      "**/node_modules/**",
+      ".agents/skills/**",
+      "repos/**",
+      "apps/daemon/**",
+      "apps/desktop/**",
+      "apps/native/**",
+      "apps/tui/**",
+      "apps/web/build/**",
+      "apps/web/.react-router/**",
+      "apps/native/.expo/**",
+      "apps/native/dist/**",
+      "apps/native/web-build/**",
+      "packages/backend/convex/_generated/**",
+    ],
+    semi: true,
+    singleQuote: false,
+    sortPackageJson: true,
+  },
   lint: {
     ignorePatterns: [
       "node_modules/**",
       "**/node_modules/**",
+      ".agents/skills/**",
+      "repos/**",
+      "apps/daemon/**",
+      "apps/desktop/**",
+      "apps/native/**",
+      "apps/tui/**",
       "apps/web/build/**",
       "apps/web/.react-router/**",
       "apps/native/.expo/**",
@@ -17,21 +44,6 @@ export default defineConfig({
       typeCheck: false,
     },
   },
-  fmt: {
-    ignorePatterns: [
-      "node_modules/**",
-      "**/node_modules/**",
-      "apps/web/build/**",
-      "apps/web/.react-router/**",
-      "apps/native/.expo/**",
-      "apps/native/dist/**",
-      "apps/native/web-build/**",
-      "packages/backend/convex/_generated/**",
-    ],
-    singleQuote: false,
-    semi: true,
-    sortPackageJson: true,
-  },
   staged: {
     "*.{js,ts,jsx,tsx,vue,svelte,json,jsonc,css,md}": "vp check --fix",
   },