Allow user to set the file types to be shown in file navigator sidebar

Lettera Lettera feedback
1

It would be great to have a preferences for which filetypes to include/display!

Three workflows where this would make a real difference:

Workflow A — Slide decks

  1. I author slides as a .md file
  2. I export an .html version for presenting
  3. Both show up identically in the navigator — same display name, no extension — so there’s no way to tell them apart at a glance

Workflow B — AI/Claude workspace (Related: Include hidden folders (e.g. .claude) in the file structure)

  1. I use a Lettera directory as a workspace for Claude to read and search through (previous writing, fetched docs, etc.)
  2. I write CLAUDE.md and SKILL.md files inside .claude/ — config files I actively need to edit
  3. But dotfolders are hidden, so I can’t reach them from the navigator at all

Workflow C — Image attachments (Related: Next Major Improvement (For Me): Image Handling)

  1. I drag images into .md files
  2. They accumulate in the directory root, and moving them into a subdirectory breaks the references in the .md file — so the clutter is effectively permanent within Lettera

In each case, the folder is the right home for these files. They just shouldn’t all compete for space in the navigator. Filtering by extension — or toggling visibility of dotfiles and derived files — would let navigation stay focused on what’s actually a note.

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