Feat/svelte export webview

[ulysse-bouchet-simvia]

[1.8.0] - 2026-04-20

Full rewrite of the .export form in Svelte + Tailwind, first-class language support for .export files (syntax highlighting, formatter, format-on-save), and a batch of UX upgrades.

Added

• Redesigned export form — rewritten in Svelte 5 + Tailwind 4, styled with VS Code theme tokens (--vscode-input-*, --vscode-focusBorder, --vscode-editorWarning-foreground, ...), so it looks native in every theme.
  • Tab icon is a blue pencil; tab title lives-updates to match the filename (falls back to untitled).
  • Titles inside the form adapt to mode: "Create a new export file" vs "Edit an export file".
  • New export files are pre-seeded with a sensible default: comm + mmed inputs and an rmed output, filenames simvia.comm / simvia.mmed / simvia.rmed.
  • .export extension locked as a visual suffix on the filename field — it can't be edited away.
  • Nested paths supported in the filename (subdir/file.export); missing folders are created on save.
  • Unsaved drafts persist via vscode.setState + retainContextWhenHidden, so switching tabs or reloading the panel no longer clears the form.
• File rows — drag-to-reorder (powered by svelte-dnd-action, theme-colored drop zones, keyboard-accessible); per-row × delete; full-width "Add input/output file" button at the end of each section.
  • Type dropdown is filtered by direction (inputs vs outputs) and shows a Type placeholder on new rows; the file-type list is the full code_aster set (comm, mmed, rmed, mess, nom, base, mail, libr, tab, msh, dat).
  • Unit auto-increment scoped to the same type and max+1 (so med: 20, 50 → next is 51, not 21), idempotent when re-picking the same type; nom rows are locked to unit 0; ArrowUp/Down steps integer inputs.
  • Name autocomplete list matches the type dropdown styling; empty rows (no type and no name) are ignored by validation and on save.
• Validation — per-field inline error messages, a sticky footer with clickable error / warning counts that smooth-scroll to the corresponding panel.
  • Blocking errors: filename required, parameters must be integers, at least one comm input file required.
  • Non-blocking warnings: duplicate unit across files (listing the file names), no mesh file set, no rmed output set, rename-in-edit-mode (tells the user the original file will be deleted).
• .export language support — new TextMate grammar (source.export) colors P/F directives, parameter names, file types, direction flags (D vs R/RC), unit numbers, and # comments.
• Document formatter for .export — available via Format Document. On save/create the form applies the same formatter automatically:
  • Groups lines into # Simulation parameters, # Input files, # Output files sections separated by blank lines.
  • Sorts F lines within each direction by a canonical type priority (comm, mmed, rmed, mess, nom, base, mail, libr, tab, msh, dat).
  • Keeps standalone # comments attached to the line they precede.
  • Emits a three-line header at the top crediting VS Code Aster and Simvia; re-saving is idempotent (no stacked headers).
• Dedicated pencil icon (media/images/icone-edit.svg) for the "Edit export file" command, replacing the plain $(book) codicon.
• Extension now activates on onLanguage:export, so opening a .export file registers the formatter without any prior command run.
• Refreshed Simvia logo (new SVG), separate light/dark variants for both Simvia and code_aster logos in the form header.

Changed

• Editing a file and changing its name now renames the file on disk (old file is deleted after the new one is written). A warning panel previews the rename before the user saves.
• When writing a file, the output is always formatted (P/F grouping, section headers, shoutout) — so files stay clean across multiple save cycles.

Fixed

• Loading an existing .export into the form (e.g. after a tab switch) no longer clobbers the pre-filled data with the seeded default.
• Removing the last row no longer leaves stale autocomplete suggestions keyed to the dead row.
• Missing parent directories no longer cause save to fail silently when the filename contains a path separator.

Removed

• The legacy vanilla HTML/CSS/JS export form (webviews/export/export.{html,css,js}) and its hardcoded blue-on-light styling.
• Unused media assets: media/images/aster.png, media/icons/3d.svg, media/icons/3d_light.svg.