[singhpratech]

Summary

• Preview pane beside the editor tabs: View › Preview Pane, Ctrl+Shift+V, or the new Preview toolbar button. Follows the current tab; placeholder on tabs it cannot preview; hidden by default and not saved in the session.
• Markdown rendered live (Qt GitHub dialect: tables, task lists, fenced code, quotes), theme-aware in Light / Dark / Monokai, relative images resolved against the file.
• HTML: Lite renders with Qt's rich-text engine; Full renders in WebEngine with JavaScript off, no remote loads, and navigation from the previewed page blocked (meta-refresh, forms, iframes). Relative images and stylesheets beside the file still load.
• Jupyter .ipynb: the file still opens as JSON; the pane shows a read-only notebook (markdown cells, In [n] code cells, stream / text / HTML / PNG outputs, tracebacks with ANSI stripped). nbformat 4.
• SQL cells: .sql files split on -- %% run cell by cell through the existing DbConnections::runQuery path on a worker thread, against a temporary scratch SQLite (DuckDB in Full) or any saved connection. Saved connections are read-only until Allow writes is ticked. Ctrl+Return runs the cell under the cursor only while the pane shows a SQL notebook. The AI and MCP SQL gates are untouched.
• Website: FAQ headings wrapped one word per line (shared card grid assumed an icon column); tables now scroll in wrappers; flavour and release cards fit 390 px; docs/MCP top bars wrap. All five pages verified at 1280 px and 390 px.
• Adds CLAUDE.md.

Why it is additive

The pane lives in a new inner QSplitter that wraps the tab widget, so the outer splitter keeps its three children (editor group, AI dock host, function list) and the AI-dock sizing, fullscreen and function-list code paths are unchanged. Session save/restore, tab handling and the MCP bridge are not touched. runQuery, the SQL classifier, ai_tools and mcp_bridge are not modified.

Affected platforms

Linux, macOS, Windows. Lite and Full flavours (Full adds the WebEngine HTML renderer and the DuckDB scratch).

Commands run

cmake --build build --target notepatra_all_tests && QT_QPA_PLATFORM=offscreen ctest        # 81/81 (WebEngine + DuckDB tree)
cmake --build build-lite --target notepatra_all_tests && QT_QPA_PLATFORM=offscreen ctest   # 78/78 (true Lite: no WebEngine, no DuckDB)
cmake --build build-full --target notepatra                                                 # Full flavour links and runs
bash scripts/stale-text-check.sh                                                            # 66 passed

Red-state checks: scratch DB switched to :memory: → test_preview_pane fails fast on cross-cell persistence; setSource removed from the tab-switch hook → fails fast on the placeholder section. Both restored.

GUI verified on an isolated Xvfb display with the real binary in Light, Dark and Monokai: Markdown, HTML (Lite engine and WebEngine, relative image loads, page script does not run), notebook with image and traceback, SQL cells run in order with persisted state, placeholder, pane off/on, Ctrl+Return scoping.

Tests

• test_notebook_render (49 assertions, pure renderers)
• test_preview_pane (62 assertions, real MainWindow offscreen)
• Registered suites: 81 Full / 78 Lite (was 79 / 76)

Release

Version bumped to 0.1.130 in CMake, notepatra-mcp/Cargo.toml, Cargo.lock and the .mcpb manifest. Release notes, CHANGELOG, README, docs page and website cards updated. Download-size figures are carried over from v0.1.129 and get corrected by the post-publish size step as usual.

🤖 Generated with Claude Code