feat: add native clipboard support for screenshot paste (#67)

## Summary
- Adds Tauri clipboard-manager plugin to read images from native clipboard
- Falls back to native clipboard when WebView clipboard API returns empty (fixes screenshot paste)
- Allows sending messages with just attachments (no text required)
- Logs attached files to output with 📎 emoji

## Test plan
- [ ] Build and run the app natively on Windows
- [ ] Copy a screenshot (Win+Shift+S) and paste in the chat input
- [ ] Verify the screenshot appears as an attachment preview
- [ ] Send the attachment and verify Claude receives the file path
- [ ] Test sending a message with only an attachment (no text)
- [ ] Verify the 📎 log line shows the attached filename

**Note:** Paste will not work in WSLg dev environment due to clipboard isolation - needs native Windows build to test.

✨ This PR was created with help from Hikari~ 🌸

Co-authored-by: Hikari <hikari@nhcarrigan.com>
Reviewed-on: #67
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

RELEASE_NOTES_v0.3.0.md

@@ -0,0 +1,74 @@
+# Hikari Desktop v0.3.0 Release Notes
+
+## New Features
+
+### AskUserQuestion Tool Support (#51)
+
+- Claude can now ask you questions with multiple choice options during conversations
+- A dedicated modal appears with answer choices and support for custom responses
+- Answers are seamlessly integrated back into the conversation context
+
+### Slash Commands
+
+- `/cd <path>` - Change the working directory while preserving conversation context (#55)
+- `/search <query>` - Search and highlight matches within the conversation (#32)
+- `/skill <name> [data]` - Invoke Claude Code skills from `~/.claude/skills/` (#57)
+- `/new`, `/clear`, `/rename`, `/help` commands for conversation management (#6)
+
+### Auto-Update Checker (#17)
+
+- Automatically checks for new releases on startup
+- Notification appears when a newer version is available
+- Can be disabled in settings
+
+### Font Size & Zoom (#19)
+
+- Adjust font size with keyboard shortcuts: `Ctrl++`, `Ctrl+-`, `Ctrl+0`
+- Font size slider in settings (10-24px range)
+- Preference persists between sessions
+
+### Resizable Character Panel (#10)
+
+- Drag the divider between the character panel and terminal to resize
+- Panel width is saved and restored on app restart
+- Sprite now uses full height for better proportions
+
+### Input History Navigation (#13)
+
+- Use up/down arrows to navigate through previous messages and commands
+- Arrow keys only navigate history when input is empty - otherwise they move the cursor (#58)
+
+### Keyboard Shortcuts (#21)
+
+- `Ctrl+N` - New conversation
+- `Ctrl+W` - Close current tab
+- `Ctrl+Tab` / `Ctrl+Shift+Tab` - Switch between tabs
+- `Ctrl+L` - Clear conversation
+- `Ctrl+,` - Open settings
+
+### Always On Top Toggle (#28)
+
+- Pin the window to stay above other applications
+- Toggle in settings
+
+## Improvements
+
+### UI/UX
+
+- Resizable chat input with drag handle (expands upward)
+- Send button properly aligned with input field
+- Markdown rendering with syntax-highlighted code blocks (#31, #33)
+- Light mode text colors improved for better readability
+- Scroll position persists per conversation tab when switching
+- Confirmation modal when closing connected tabs
+- Links in chat now open in default browser (#54)
+- Spaces allowed when renaming tabs (#52)
+
+### State Management
+
+- Stats (tokens, cost) persist across session changes and only reset on disconnect (#59)
+- Multiple tabs can now request permissions simultaneously without conflicts
+
+## Closed Issues
+
+#6, #10, #13, #17, #19, #21, #28, #31, #32, #33, #51, #52, #54, #55, #57, #58, #59