feat(commands): add ObsidianMoveNote with folder picker and buffer pa…

[daikiejp]

Summary

• Add a new :ObsidianMoveNote command to move the current markdown note to another folder inside the active vault.
• Open a folder picker rooted at the vault root (supports configured pickers: telescope/fzf-lua/mini.pick, with vim.ui.select fallback).
• Keep the current buffer synced to the moved file path, while handling no-op and collision cases safely.

Behavior

• Validates that the current buffer is a markdown note within the active vault.
• Lists vault folders (including vault root as /) and lets the user select a target.
• Aborts when target folder is the same as current or when a file with the same name already exists.
• Saves the buffer, moves the note, removes the old file, and keeps the user in the moved note buffer.

Testing

• Added test coverage in test/obsidian/note_spec.lua:
  • ObsidianMoveNote should include the vault root in folder options
• Ran:
  • make test TEST=test/obsidian/note_spec.lua
• Result:
  • 18 passed, 0 failed

Compatibility

• ObsidianMoveNote command uses vim.fs.dir (0.8) and vim.ui.select (0.8) :)