* fix: show download preparation toast and prevent duplicate zip jobs
Downloading a file or folder from the file navigator gave no feedback while the server prepared the response, which can take 30 seconds or more for large folders that are zipped server-side. Users assumed the click did nothing and pressed Download again, starting additional zip jobs on the server. Both downloadFile and bulkDownload, the two functions every download control funnels through, now show a persistent "Preparing download..." loading toast while the request is in flight and dismiss it once the download starts or fails. A shared downloading flag makes repeated clicks no-ops until the current download finishes, so a single click starts exactly one server-side job. Fixes#27055
* fix: report terminal download failures instead of dismissing the toast
A failed download dismissed the preparation toast without saying anything, which reads as the download silently disappearing. Both download paths now report the failure. The two helpers also declare a nullable return but could still reject once the response body started streaming, so an interrupted transfer escaped as an unhandled rejection and left the same silent dismissal. They now return null in that case, which also stops an interrupted preview from leaving its spinner running.
- HTML preview (iframe) no longer shows Edit/Save toolbar buttons
- Clicking Source toggle opens CodeMirror editor with syntax highlighting
- Save button appears only in source mode, using saveCodeFile()
- Ctrl+S saving supported via CodeMirror keybinding
- Add FileCodeEditor.svelte: CodeMirror wrapper with auto language
detection, dark mode, Ctrl+S save, reactive to value/filePath changes
- Replace Shiki read-only highlighting + textarea editing with
always-editable CodeMirror for code files in FileNav preview
- Show persistent Save button for code files in toolbar
- Non-code text files keep existing Edit/Save/Cancel textarea flow
- SVG retains Shiki highlighting for visual preview mode
- Add notebook API functions (createNotebookSession, executeNotebookCell, stopNotebookSession)
- Create CellEditor component with CodeMirror for cell editing
- Rewrite NotebookView with session-based execution, Run All, Restart, Stop
- Kernel status indicator with tooltips
- Wire baseUrl/apiKey through FilePreview and FileNav
Backend emits terminal events for write_file, replace_file_content,
and run_command. Frontend showFileNavDir subscriber uses startsWith
path matching to smartly refresh only when the event is relevant:
- write_file/replace_file_content: refresh if path is in current view
- run_command: always refresh (uses root '/' which matches everything)
- Also adds copy-to-clipboard button and code preview full-height fix
- New SqliteView component with table tabs, paginated data view
(100 rows/page), SQL query editor (Cmd+Enter), NULL/BLOB formatting,
sticky column headers, and dark mode
- Supports .db, .sqlite, .sqlite3, .db3 extensions
- Uses sql.js WASM served locally from /sql.js/sql-wasm.wasm
- Also fixes display_file handling when another file is already open
- Move refresh button out of directory-only block in FileNavToolbar
- When viewing a file, refresh reloads that file's content
- When in directory view, refresh reloads the listing (unchanged)
- New NotebookView component renders markdown cells (marked+DOMPurify),
code cells (Shiki-highlighted with execution count gutter), and
outputs (text, HTML tables, base64 images, error tracebacks)
- ANSI escape codes stripped from error output
- Source toggle shows raw JSON
- Dark mode support throughout
- New JsonTreeView component with recursive collapsible nodes,
auto-expand depth, and GitHub-themed dark mode colors
- JSON/JSONC/JSON5 files show tree view by default, toggle to
Shiki-highlighted source
- SVG files show rendered preview (DOMPurify-sanitized) by default,
toggle to Shiki-highlighted XML source
- SVG removed from IMAGE_EXTS to enable text-based preview
- YAML/TOML already covered by Shiki bundled languages
