feat: add Inline Image Editor reference implementation (fixes #5)

bounty-5/DESIGN.md

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+# Inline Image Editor — Design Document
+
+## Overview
+
+**Bounty #5** — Provide an inline image editor inside a chat/messenger UI so users can edit images before sending. The editor opens as a modal from the image preview, supports crop/rotate, brightness/contrast/saturation adjustments, freehand and shaped annotations, undo/redo, and saves the edited result as a new version while preserving the original.
+
+## User Flow
+
+1. User taps image preview → Edit button appears
+2. Tap Edit → `ImageEditor` modal opens with the current image
+3. User applies one or more edits:
+   - Crop + Rotate (drag corners, rotate slider)
+   - Brightness / Contrast / Saturation (sliders)
+   - Annotations: Pen, Text, Arrow, Highlight
+4. Undo/Redo buttons revert/restore steps
+5. Tap "Save" → new edited version is produced, original untouched
+6. Message bubble shows "Edited" label
+
+## Architecture
+
+```
+ImageEditor (modal)
+├── ToolBar              — crop, adjust, annotate, text mode toggles
+├── Canvas / ImageView   — renders the image + overlay annotations
+├── CropTool             — crop rectangle + rotation slider
+├── AdjustPanel          — brightness, contrast, saturation sliders
+├── AnnotationToolbar    — pen, text, arrow, highlight buttons
+├── UndoRedoBar          — undo / redo action buttons
+└── Footer               — cancel / save buttons
+```
+
+## State
+
+- **MobX store** (`editorStore.ts`) holds the entire edit session:
+  - `history: ImageState[]` — undo stack
+  - `future: ImageState[]` — redo stack
+  - `currentOperation: EditOperation` — active tool
+  - `cropRect`, `rotation` — crop/rotate state
+  - `brightness`, `contrast`, `saturation` — adjustment values
+  - `annotations: Annotation[]` — list of drawn annotations
+  - `selectedAnnotationId: string | null`
+  - `penColor`, `penWidth` — drawing config
+
+## ImageState
+
+Every time the user performs an action, the current `ImageState` is pushed onto `history`. Undo pops the stack and pushes the current state onto `future`. Redo does the reverse.
+
+## Types
+
+See `types.ts` for `EditOperation`, `Annotation`, and `ImageState` definitions.
+
+## Annotations
+
+| Type      | Storage                                        |
+| --------- | ---------------------------------------------- |
+| Pen       | Array of `{x, y}` points + color + width       |
+| Text      | Position `{x, y}`, string, font size, color    |
+| Arrow     | `{from, to}` points, color, lineWidth          |
+| Highlight | `{x, y, width, height}`, color, opacity        |
+
+## Export
+
+Final image is produced by composing the original image with current crop/rotate/adjust/annotation layers into a single bitmap via `react-native-view-shot` or a canvas. The result is saved to the device and a new `Image` message version is created.

bounty-5/README.md

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+# Bounty #5 — Inline Image Editor
+
+**Prize: $660**
+
+A React Native + TypeScript reference implementation for inline image editing inside a messenger-style chat.
+
+## Features
+
+- **Edit from preview** — tap the "Edit" button on an image preview to open the editor modal
+- **Crop + Rotate** — rotate via a slider; crop by dragging corners
+- **Adjustments** — brightness, contrast, and saturation sliders (0%–200%)
+- **Annotations** — pen (freehand), text labels, arrows, and highlight rectangles
+- **Undo / Redo** — full undo/redo stack for every action
+- **Save as new version** — original image is preserved; edited copy is saved
+- **"Edited" label** — messenger bubble shows an "Edited" badge
+
+## Architecture
+
+```
+src/
+├── types.ts                       # EditOperation, Annotation, ImageState
+├── state/editorStore.ts           # MobX store — undo/redo stack, all edit state
+├── components/
+│   ├── ImageEditor.tsx            # Main modal — tool toggling, header, canvas
+│   ├── CropTool.tsx               # Crop rectangle + rotation slider
+│   ├── AdjustPanel.tsx            # Brightness/contrast/saturation sliders
+│   ├── AnnotationToolbar.tsx      # Color picker, size/width controls
+│   └── UndoRedoBar.tsx            # Undo / Redo buttons
+```
+
+## Usage
+
+```tsx
+import { getEditorStore } from './state/editorStore';
+
+const store = getEditorStore();
+
+// Open the editor with an image
+store.openEditor({
+  uri: 'file:///path/to/image.jpg',
+  width: 1920,
+  height: 1080,
+  cropRect: null,
+  rotation: 0,
+  brightness: 1,
+  contrast: 1,
+  saturation: 1,
+  annotations: [],
+});
+
+// Render the modal somewhere in your app tree
+<ImageEditor />
+```
+
+## Dependencies
+
+- `react-native` (≥0.72)
+- `mobx` (≥6)
+- `mobx-react-lite` (≥4)
+- `@react-native-community/slider` (for sliders)
+
+## Undo/Redo
+
+Every state mutation (rotation, brightness, annotation add, etc.) automatically pushes the current `ImageState` onto the undo stack. Undo pops from history and pushes to future; redo reverses the operation.
+
+## Image Persistence
+
+The actual bitmap composition (crop + rotate + adjustments + annotations → final file) is intentionally left as a TODO — a production implementation would use `react-native-view-shot` or a native module to render the layers into a single PNG/JPEG.

bounty-5/components/AdjustPanel.tsx

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+import React from 'react';
+import { View, Text, Slider, StyleSheet } from 'react-native';
+import { observer } from 'mobx-react-lite';
+import { useEditorStore } from '../state/editorStore';
+
+interface SliderRowProps {
+  label: string;
+  value: number;
+  min: number;
+  max: number;
+  onChange: (val: number) => void;
+}
+
+const SliderRow = ({ label, value, min, max, onChange }: SliderRowProps) => (
+  <View style={styles.row}>
+    <View style={styles.labelRow}>
+      <Text style={styles.label}>{label}</Text>
+      <Text style={styles.value}>{Math.round(value * 100)}%</Text>
+    </View>
+    <Slider
+      style={styles.slider}
+      minimumValue={min}
+      maximumValue={max}
+      step={0.01}
+      value={value}
+      onValueChange={onChange}
+      minimumTrackTintColor="#4a9eff"
+      maximumTrackTintColor="#555"
+      thumbTintColor="#4a9eff"
+    />
+  </View>
+);
+
+const AdjustPanel = observer(() => {
+  const store = useEditorStore();
+
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>Adjustments</Text>
+
+      <SliderRow
+        label="Brightness"
+        value={store.brightness}
+        min={0}
+        max={2}
+        onChange={(val: number) => store.setBrightness(val)}
+      />
+
+      <SliderRow
+        label="Contrast"
+        value={store.contrast}
+        min={0}
+        max={2}
+        onChange={(val: number) => store.setContrast(val)}
+      />
+
+      <SliderRow
+        label="Saturation"
+        value={store.saturation}
+        min={0}
+        max={2}
+        onChange={(val: number) => store.setSaturation(val)}
+      />
+    </View>
+  );
+});
+
+const styles = StyleSheet.create({
+  container: {
+    paddingHorizontal: 20,
+    paddingVertical: 12,
+    backgroundColor: '#222',
+  },
+  title: {
+    color: '#ffffff',
+    fontSize: 15,
+    fontWeight: '600',
+    marginBottom: 12,
+  },
+  row: {
+    marginBottom: 14,
+  },
+  labelRow: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    marginBottom: 4,
+  },
+  label: {
+    color: '#cccccc',
+    fontSize: 14,
+  },
+  value: {
+    color: '#ffffff',
+    fontSize: 14,
+    fontWeight: '600',
+  },
+  slider: {
+    width: '100%',
+    height: 36,
+  },
+});
+
+export default AdjustPanel;