feat: Align interactions with IntelliJ IDEA (#22)

* feat(nav): Complete file paths and flag unresolved web file references

Path completion in href/src/url()/@import, Markdown links and path-like strings, folders first. HTML and CSS paths that name no file get a 'Cannot resolve file' warning. File references resolve in the backend like IDEA's: relative to the file, /-rooted against the project and resource roots.

* feat: Align editor, workbench, run/debug and VCS interactions with IntelliJ IDEA

Keymap
- Let AltGr characters through instead of firing Ctrl+Alt shortcuts (Windows/Linux)
- Double Shift: strict press/release timing, ignored while typing or after Shift+click
- Chords wait 2s and swallow an unmatched second stroke
- Drop CodeMirror defaults that clash with IDEA keys; ⌘Enter is Split Line, add
  Scroll to Center and Code Block Start/End
- Add missing IDEA defaults (⌃J, ⌘Y, ⇧⌘C, ⌥⌘Y, ⇧⌘M, F9 Resume, ⌘R Rerun, …)

Editor
- Tab inserts at the caret; smart Backspace to the proper indent; Enter continues
  a `//` comment; per-language line comment placement
- Back/Forward records navigations only; ⌘F searches the selected text
- In-place rename; ⌃Space inserts a sole candidate; commit characters only for a
  focused lookup; usage highlighting survives edits; ⌥Enter offers fixes from the
  caret line; ⌘-hover shows declaration info only for navigable targets

Workbench
- Tool windows: primary and split area per side, six Move To anchors, layout migration
- ⌘W closes tool window content; Shift+Esc from the editor; closing a tab
  activates the left neighbour; preview tab and tab limit follow IDEA defaults
- Switcher lists open editors and tool windows; Recent Files Delete removes items
- Search Everywhere tab/scope behaviour; popups close when the window deactivates
- Project view: Copy/Move dialogs on paste, skippable usage search on delete,
  new-file input cancels on blur; Settings search Esc clears the filter
- Status bar breadcrumbs open a children popup; notification timeouts

Run / Debug / Build / Terminal
- Run asks to stop a running single-instance config; Rerun restarts silently;
  "Allow multiple instances" option
- Run chooser: Enter runs, Shift debugs, F4/Delete/digits
- Type into the console for stdin; Stop covers debug sessions
- Log (Shift+click) and temporary (Alt+click) breakpoints; independent suspend/log
  options; Evaluate prefill and history; changed-value highlighting; expandable hints
- Build window opens on failure and jumps to the first error
- Terminal confirms closing a busy tab and lets IDE shortcuts through

VCS
- Correct ours/theirs labels during rebase, cherry-pick and revert
- Smart/Force Checkout; remote branch checkout updates the local branch
- Partial commit by changed block; inline before-commit check results
- F7 continues into the next file; Rollback Lines; Commit and Push; Amend message swap
- Branch delete with Restore; force push confirmation; editable push target;
  update summary with the incoming commits

* chore: Regenerate bindings

src/workbench/toolwindows/ToolWindows.module.css

@@ -46,6 +46,35 @@
   grid-area: editor;
 }
 
+/* A side: primary and split areas, each an island; stacked on the left and right, side by side at the bottom. */
+.side {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  min-height: 0;
+}
+.sideRow {
+  flex-direction: row;
+}
+/* --split-a / --split-b: the stored ratio (SidePanel), moved directly while the splitter is dragged. */
+.areaFirst {
+  flex: var(--split-a, 1) 1 0px;
+}
+.areaSecond {
+  flex: var(--split-b, 1) 1 0px;
+}
+.island[hidden] {
+  display: none;
+}
+.side > .splitGap {
+  flex: none;
+  height: var(--island-gap);
+}
+.sideRow > .splitGap {
+  height: auto;
+  width: var(--island-gap);
+}
+
 /* Islands: rounded surfaces on the frame background, separated by gaps. */
 .island {
   position: relative;
@@ -168,6 +197,21 @@
 .stripeSpacer {
   flex: 1;
 }
+.stripeGroup {
+  flex: none;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: inherit;
+}
+/* Between a stripe group's primary and split windows. */
+.stripeSeparator {
+  flex: none;
+  width: 16px;
+  height: 1px;
+  margin: 2px 0;
+  background: var(--border);
+}
 .stripeButton {
   position: relative;
   flex: none;