feat(release): add release notes for v0.7.1

Author: crim50n

RELEASE_NOTES_0.7.1.md

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+# PDAI v0.7.1 — Release Notes
+
+## New Features
+
+### Favorites (Like)
+
+- "Favorite" button (heart) in image detail view
+- Like indicator in gallery grid (red heart in the top right corner)
+- Bulk like: "Like" button in selection mode likes all selected images
+- "Delete Unliked" function in gallery menu — deletes all images without a like
+- Real-time sync of like status between detail view and grid
+- Like status persists between sessions
+
+### Hide Images
+
+- Bulk hide: "Hide" button in selection mode hides all selected images
+- Real-time sync of hide status between detail view and grid
+- Fallback for Android < 12: dimming with icon instead of blur
+
+### Image Editor
+
+Built-in editor for generated images:
+
+- Rotate left/right
+- Flip horizontally and vertically
+- Adjust brightness, contrast, and saturation
+- Save changes to original or as a new image
+
+---
+
+### Completely Redesigned Gallery with Improved Performance
+
+**Smart Loading:**
+- Thumbnails load only for visible items
+- File-based thumbnail loading (no Base64) — fixed OOM on fast scrolling
+- BlurHash placeholders — blurred preview while thumbnail loads
+- Shimmer animation for items without BlurHash
+- Two-level cache for thumbnails and full images
+
+**Grid Management:**
+- Grid size from 1 to 6 columns (previously 2-5)
+- Pinch to resize thumbnails
+- Draggable scrollbar for fast navigation
+
+**Drag Selection:**
+- Long press activates selection mode
+- Dragging finger selects a range of images
+- Dragging back deselects
+- Auto-scroll when reaching screen edges
+- Smooth animations when opening images
+
+**Selection Mode Actions:**
+- Like (heart) — like all selected
+- Hide (eye) — hide all selected
+- Delete — delete all selected
+- Save to device gallery
+- Export
+
+**Update on Delete:**
+- Gallery auto-updates when deleting images from detail view
+- Gallery auto-updates after generation completes
+
+---
+
+### UI Improvements
+
+**Floating Generation Indicator:**
+- Global generation status widget over all screens
+- Swipe left/right to temporarily hide
+- Automatically appears on status change (generation start/result)
+- Does not block navigation (drawer opens over widget)
+
+**Collapsible Header:**
+- Top bar hides on scroll down
+- Appears on scroll up or when reaching top of list
+- Standard NestedScrollConnection pattern (like Google Photos)
+- Unified height of 72dp on all screens
+
+**Swipe Navigation:**
+- Swipe between home screen tabs (HorizontalPager)
+- Drawer opens only by button (not edge swipe)
+
+**Image Viewing:**
+- Double tap to zoom/reset
+- Swipe up/down to show/hide info
+- Fixed artifacts when swiping between images
+
+**Navigation Bar:**
+- Smoothly hides in fullscreen view
+- Automatically appears when returning to gallery
+
+**Image Details:**
+- "Share" button
+- "Save to device gallery" button
+- "Favorite" (like) button
+
+---
+
+## Fixes
+
+### Image Export
+- Fixed OOM when exporting many images
+- Direct file copy instead of loading into memory (Base64)
+- Parallel processing (4 threads) for faster export
+
+### "Report" Button
+- Disabled for Full and FOSS builds (Play Store only)
+
+### Aspect Ratio
+- Aspect ratio now always uses width as the base (not the longer side)
+
+### Fal AI
+- Fixed issue with API keys containing control characters
+- `requestId` field in Fal AI response is now optional (fixed crash on fast completion)
+
+---
+
+## Visual Changes
+
+- Updated notification icon
+
+---
+
+## Technical Changes
+
+### Dependencies
+
+- Added BlurHash 0.3.0 for blurred placeholders in gallery
+
+### Database
+
+- Migration v10 → v11: added `blur_hash` field to generation results table
+- Migration v11 → v12: added `liked` field for favorites feature
+
+### New Components
+
+- `ImageEditor` — image editing screen
+- `CollapsibleScaffold` — scaffold with collapsible header
+- `DraggableScrollbar` — draggable scrollbar
+- `DragSelectionState` / `DragSelectionUtils` — drag selection
+- `ThumbnailGenerator` — thumbnail generator
+- `ImageCacheManager` — image cache manager
+- `BlurHashEncoder` / `BlurHashDecoder` — BlurHash encoding/decoding
+- `GalleryItemStateEvent` — real-time sync of hide/like states
+- `GetThumbnailInfoUseCase` / `GetGalleryItemsRawUseCase` — use cases for file-based thumbnail loading
+- `ToggleLikeUseCase` / `DeleteAllUnlikedUseCase` — use cases for favorites feature
+- `LikeItemsUseCase` / `HideItemsUseCase` — use cases for bulk operations
+
+---
+
+## Localization
+
+Added strings:
+- Share, Edit, Save to gallery
+- Rotate, Settings, Brightness, Contrast, Saturation
+- Delete unliked, confirm delete unliked
+