fix: blockquote reference numbers out of sync with rendered numbers

## Summary - **Bug**: A blockquote reference (e.g. `[see alg](#bqref-alg:foo)`) would render as "Algorithm 5.1" while the actual blockquote displayed "Algorithm 5.5", whenever unlabeled blockquotes of the same type preceded the labeled one in the same section. - **Root cause**: `MarkdownProcessor.processBlockquotes` skipped incrementing the counter for blockquotes without an `id`, but `Notie.tsx`'s DOM `useEffect` counts *all* blockquotes regardless of whether they have a label — causing the two numbering systems to diverge. - **Fix**: Move the `!idAttr` guard to after the counter increment, so the counter advances for every supported blockquote type (matching DOM behavior), and the mapping is only written when an `id` is present. ## Test plan - [ ] A labeled blockquote preceded by unlabeled blockquotes of the same type in the same section: reference number matches the rendered blockquote number - [ ] Labeled blockquote with no preceding unlabeled blockquotes: still numbered correctly (no regression) - [ ] Mixed types in a section (e.g. definition, theorem, algorithm): each type's counter is independent and correct 🤖 Generated with [Claude Code](https://claude.com/claude-code)