Add v0.3.1 changelog to docs site

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: johnsideserf

docs/src/SUMMARY.md

@@ -1,6 +1,7 @@
 # Summary
 
 [Introduction](introduction.md)
+[Changelog](changelog.md)
 
 ---
 

docs/src/changelog.md

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+# Changelog
+
+## v0.3.1
+
+### Image attachments
+
+- **Embedded file links** -- attachment URIs are now hidden behind clickable
+  bracket text (e.g. `[image: photo.jpg]`) instead of showing the raw
+  `file:///` path
+- **Double extension fix** -- filenames like `photo.jpg.jpg` are stripped to
+  `photo.jpg` when signal-cli duplicates the extension
+- **Improved halfblock previews** -- increased height cap from 20 to 30
+  cell-rows for better inline image quality
+- **Native image protocols** -- experimental support for Kitty and iTerm2
+  inline image rendering, off by default. Enable via `/settings` >
+  "Native images (experimental)"
+- **Pre-resized encoding** -- native protocol images are resized and cached
+  as PNG before sending to the terminal, avoiding multi-megabyte raw file
+  transfers every frame
+
+### Attachment lookup
+
+- **MSYS/WSL path fix** -- `find_signal_cli_attachment` now checks both
+  platform-native data dirs (`AppData/Roaming`) and POSIX-style
+  (`~/.local/share`) where signal-cli stores files under MSYS or WSL.
+  Fixes outgoing images sent from Signal desktop not displaying in the TUI.
+
+### Platform
+
+- **Windows Ctrl+C fix** -- suppress the `STATUS_CONTROL_C_EXIT` error on
+  exit by disabling the default Windows console handler (crossterm already
+  captures Ctrl+C as a key event in raw mode)
+
+### Documentation
+
+- mdBook documentation site with custom mIRC/Win95 light theme and dark mode
+  toggle
+
+---
+
+## v0.3.0
+
+Initial public release.
+
+- Terminal Signal client wrapping signal-cli via JSON-RPC
+- Vim-style modal input (Normal/Insert modes)
+- Sidebar with conversation list, unread counts, typing indicators
+- Inline halfblock image previews
+- OSC 8 clickable hyperlinks
+- SQLite persistence with WAL mode
+- Incognito mode (`--incognito`)
+- Demo mode (`--demo`)
+- First-run setup wizard with QR device linking
+- Slash commands: `/join`, `/part`, `/quit`, `/sidebar`, `/help`, `/settings`,
+  `/mute`, `/notify`, `/bell`
+- Input history (Up/Down recall)
+- Autocomplete popup for commands and @mentions
+- Configurable notifications (direct/group) with terminal bell
+- Cross-platform: Linux, macOS, Windows