v0.5.0

Added

• Search-and-replace diffs — AI can now send targeted <<<REPLACE / === / >>> blocks instead of full code replacement, saving tokens on large scripts. Falls back to full replacement automatically.
• Syntax-highlighted code blocks in AI chat responses — OpenSCAD/synapscad code uses the same color scheme as the editor (keywords, builtins, strings, numbers, comments)
• Bottom and Isometric views — AI now receives 5 rendered views (Front, Right, Top, Bottom, Iso) for better spatial understanding
• Chat input history preserves images — pressing ↑/↓ in chat input restores both text and attached images
• Session-aware chat — after app restart, previous chat messages are displayed but not re-sent to the AI, preventing context pollution from old sessions
• Code clear resets AI chat — clearing the code editor also resets the AI chat for a fresh session

Fixed

• Error messages always expanded — error responses in chat are forced open regardless of persisted collapse state
• macOS .app bundle launch — added NSPrincipalClass to Info.plist and ad-hoc code signing in release workflow to prevent Gatekeeper blocking
• Verification prompt rendering — backtick-fenced text in verification prompts no longer incorrectly rendered as code blocks

Changed

• Splash screen duration reduced from 3s to 1.5s (fade from 0.5s to 0.3s)