Update README demo GIF

- Sync CLAUDE.md code map with AGENTS.md (version 0.5.0, add dropIndex/treeExpansion/revealPath/touchLongPress modules)
- Move historical development plan from docs/plans/ to docs/archive/
- Remove unused docs/screenshots/smart-explorer-right-panel.png (no longer referenced)

chore: repo cleanup

…ization

The virtualized list rebuilt its visible-row DOM on every scroll event,
which made flat list scrolling move noticeably more content per wheel
input than the non-virtualized tree view (perceived as 'too fast').

Raise VIRTUAL_THRESHOLD out of reach so the list renders all rows
directly, matching the tree view path and its scroll behavior. The
VirtualList code is retained for a future fix that re-enables
virtualization without the speed regression.

Entering or exiting inline rename (and background vault-event rebuilds)
called renderList, which emptied the container and rebuilt the DOM. Two
issues caused the list to jump:

1. scrollTop was restored while the container was still empty, so the
   browser clamped it to 0 — the list flashed to the top / selected row.
2. input.focus() scrolls the focused row into view by default, fighting
   the restored position asynchronously.

Split renderList into renderListContent + a try/finally wrapper that
restores scrollTop only after the new DOM exists (via VirtualList.scrollTo
or a direct assignment). Pass { preventScroll: true } to focus so it no
longer scrolls. Remove the now-redundant scrollTop save/restore in the
manual-reorder handlers, which renderList now owns.

…name-position

fix: align list scroll speed with tree view and stabilize rename position

Obsidian emits a single rename event for the folder itself when a folder
is renamed or moved, not for each child file. The previous handler only
updated tree-expansion and selection state, leaving the file index with
stale child records and the manual order with stale paths that the next
manual-mode render would prune — silently losing the user's sort for the
entire moved folder.

Add FileIndex.renameFolder to rewrite every record at or under the old
path to its new location (path + parentPath), and rewrite matching
manualOrder entries via the existing renameNestedPath helper. Added tests
covering nested files, record-count preservation, no-op, and
shared-name-prefix guards.

Three data-safety improvements bundled (same file):

1. onClose now flushes a pending manual-order save instead of just
   clearing the debounce timer. Previously a reorder followed by quickly
   closing the leaf within the 500ms window dropped the save, losing the
   user's most recent sort on next load.

2. The create handler no longer appends new files to manualOrder inline.
   That append contradicted initializeManualOrder's reconcile, which
   places missing files at their seed-sorted position — so ordering
   depended on whether files were created before or after the last manual
   session. Reconcile now owns new-file placement consistently.

3. Inline create/rename rejects names containing '/', '\', or '..'. A
   typed or pasted name with path separators previously created files at
   unintended nested locations or escaped the target folder.

fix: vault rename data integrity, manual order persistence, name validation

release: 0.5.1