v2.4.3 — Block Equation Fix & Open File Location

Block equations are stable in both supported forms, and files can now reveal their location directly from the sidebar.

🧮 Block equations (#33)

• Fixed multiline $$ ... $$ equations crashing Noteriv and displaying a blank application-error screen.
• Added display-math rendering for equations written on one line, such as $$ E = mc^2 $$.
• Fixed content after a block equation being truncated or hidden.
• Clicking a rendered block equation in Edit mode reveals its raw Markdown source for editing; View mode keeps it rendered.
• Moved layout-affecting equation decorations to CodeMirror's state-backed decoration system, preventing the block-decoration exception that caused the crash.

📂 Open file location (#32)

• Right-click a file in the sidebar and choose Open File Location to open its containing folder in Finder, File Explorer, or your Linux file manager.
• Folders now provide Open Folder Location to open the selected folder directly.
• The new actions use the operating system's default file manager and work across Windows, macOS, and Linux.

📎 Other

• Bumped the desktop app version to 2.4.3 across package.json, Cargo.toml, tauri.conf.json, and their lockfiles.