feat(document-mode): folder layout v2, glow on pending, inline formatting, autosave fix (#107)

## Autosave bug fix (top priority)

The 250ms debounce on the localStorage draft write was racing the unmount
cleanup: typing then navigating within 250ms cleared the pending timer
*before* it flushed, which is exactly when we needed the draft saved.
Drafts are now written synchronously on every keystroke. localStorage
.setItem on a small string is sub-millisecond — the debounce was a
premature optimisation.

## Sidebar v2 (document-directives.tsx)

- Tasks now live in a `tasks/` subfolder inside each directive folder
  (orchestrator, completion, and started step tasks). The pinned `.md`
  document remains at the top of the directive folder.
- Status circles moved to the RIGHT side only (previously rendered on
  both sides, which the user found noisy).
- New `StatusDot` component composes the status colour with two optional
  modifiers: a "live" pulse when the orchestrator is running, and a
  GLOW (amber ring + pulse) when there is a pending user question for
  that directive or task. The glow is sourced from the existing
  SupervisorQuestionsContext, indexed by `directiveId` and `taskId`.
- New `TaskIcon` (terminal) and `CompletionIcon` (PR-bracket) so
  orchestrator/step/completion entries look distinct from the .md file.

## Inline formatting in the editor (DocumentEditor.tsx)

- New `MarkdownShortcutPlugin` (scoped to TEXT_FORMAT_TRANSFORMERS only)
  so typing `**foo**`, `*foo*`, `` `foo` ``, `~~foo~~` auto-formats inline.
  Block-level shortcuts (# heading, - list) are intentionally excluded so
  the document shape (H1 / goal / StepsBlock / trailing para) stays intact.
- New `FloatingFormatToolbar` appears above any non-collapsed selection
  inside the goal paragraph, with B / I / U / S / </> buttons that
  dispatch FORMAT_TEXT_COMMAND. Buttons highlight when the corresponding
  format is active. Standard ⌘B / ⌘I / ⌘U keyboard shortcuts also work
  via the existing RichTextPlugin.
- Round-trip via a small inline-only markdown serializer/parser so
  formatting persists across saves. Supported markers: `\``code\``,
  `***bold-italic***`, `**bold**`, `*italic* / _italic_`, `~~strike~~`.
  Underline survives within the editor session (toolbar / shortcut) but
  has no markdown syntax so it does not round-trip — by design.
- No backend schema change: `directive.goal` is still a TEXT column, it
  just contains inline markdown now.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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