chore: add Gemini Code Assist PR review config

.gemini/config.yaml

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+# Gemini Code Assist — PR review configuration
+# Docs: https://developers.google.com/gemini-code-assist/docs/customize-gemini-behavior-github
+have_fun: false
+
+code_review:
+  disable: false
+  # Only surface issues that matter; avoid nitpick noise.
+  comment_severity_threshold: MEDIUM
+  # No cap on the number of inline comments.
+  max_review_comments: -1
+  pull_request_opened:
+    help: false
+    summary: true
+    code_review: true
+
+# Don't review generated / vendored / binary files.
+ignore_patterns:
+  - "**/node_modules/**"
+  - "ios/Pods/**"
+  - "ios/build/**"
+  - "**/build/**"
+  - "**/*.lock"
+  - "yarn.lock"
+  - "package-lock.json"
+  - "ios/fastlane/screenshots/**"
+  - "**/*.png"
+  - "**/*.pbxproj"

.gemini/styleguide.md

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+# SnapBiodata — review style guide
+
+Gemini Code Assist: review PRs against the conventions below. Focus on
+correctness, then simplicity and consistency. Keep feedback concise and
+actionable; skip subjective style nits already handled by ESLint/Prettier.
+
+## Stack
+- React Native 0.81 (New Architecture / bridgeless) + Expo 54 modules, TypeScript, Yarn.
+- Builds/submits via **EAS** (`yarn eas:build:*`, `yarn eas:submit:*`); Fastlane is only for App Store screenshots/metadata.
+- Fully **offline, on-device** app — no backend, no accounts. Flag any code that adds network calls or remote data dependencies for the core flow.
+
+## Architecture (keep these invariants)
+- The biodata field schema in `src/data/biodata.ts` is the single source of truth for the form, the native preview, and the PDF. New fields go there, not hard-coded in screens.
+- The on-screen preview is rendered **natively** (`src/components/BiodataDocument.tsx`). HTML (`src/templates/html.ts`) is used **only** for the expo-print PDF. The app ships **zero WebViews** — flag any reintroduction of `react-native-webview` in app code.
+- Safe-area insets are provided statically via `SafeAreaInsetsContext` in `App.tsx` (NOT `<SafeAreaProvider>`, which crashes on launch under the new architecture). Do not reintroduce `SafeAreaProvider`.
+- Drafts persist to AsyncStorage on **navigation**, not per keystroke (avoids a read-modify-write race). Preserve that.
+
+## Conventions
+- TypeScript: no `any`; type component props explicitly.
+- Styling: use `StyleSheet.create`; avoid inline style object literals in JSX (ESLint `react-native/no-inline-styles`). Pass dynamic values as variables.
+- Responsive: screens cap content to `MAX_CONTENT_WIDTH` (`src/theme.ts`) and center it so layouts read well on iPad.
+- Accessibility: interactive elements need `accessibilityRole` and `accessibilityLabel`.
+- npm scripts follow `<action>:<profile>:<platform>` with colons (e.g. `eas:build:ios:production`), plus short aliases like `dev`/`staging`/`prod`.
+
+## Flag as issues
+- New network/backend dependency in the core biodata flow.
+- Reintroducing WebView or `SafeAreaProvider`.
+- Secrets committed (e.g. `*.p8`, `.asc.env`, keystores) — these must stay gitignored.
+- Blocking the JS thread, or per-keystroke storage writes.
+- Missing error handling around `expo-print` / `expo-image-picker` / AsyncStorage calls.