refactor: Migrate zoom control and expand/collapse to hyperscript

- Move initZoomControlButtons() from main.js to hyperscript handlers
  - zoom-toggle-button: on click call toggleZoomControl()
  - zoom-close: on click call hideZoomControl()
  - show-zoom-menu-btn: on click call showZoomControl()
- Move expandAllSections/collapseAllSections from JS to utils._hs
- Add zoom visibility functions to zoom._hs:
  - showZoomControl(), hideZoomControl(), toggleZoomControl()
- Update hamburger menu links to use hyperscript calls

Eliminates ~75 more lines of JavaScript in favor of declarative
hyperscript, continuing the pattern of moving behavior to ._hs files.

static/hyperscript/utils._hs

@@ -134,6 +134,27 @@ def handleScroll()
   set :lastScroll to currentScroll
 end
 
+-- ==============================================================================
+-- EXPAND/COLLAPSE ALL SECTIONS
+-- ==============================================================================
+-- Expand all <details> elements in the CV
+def expandAllSections(evt)
+  if evt then call evt.preventDefault() end
+  set details to document.querySelectorAll('details')
+  for d in details
+    set d's @open to ''
+  end
+end
+
+-- Collapse all <details> elements in the CV
+def collapseAllSections(evt)
+  if evt then call evt.preventDefault() end
+  set details to document.querySelectorAll('details')
+  for d in details
+    call d.removeAttribute('open')
+  end
+end
+
 -- ==============================================================================
 -- FOOTER HOVER INTERACTION
 -- ==============================================================================

static/hyperscript/zoom._hs

@@ -100,14 +100,42 @@ def initZoomControl(control)
 end
 
 -- ==============================================================================
--- ZOOM CLOSE HANDLER
+-- ZOOM VISIBILITY HANDLERS
 -- ==============================================================================
--- Called when clicking the close button on zoom control
-def handleZoomClose(control)
-  add .zoom-hidden to control
-  set localStorage['cv-zoom-visible'] to 'false'
+-- Show zoom control
+def showZoomControl()
+  set control to document.getElementById('zoom-control')
   set menuBtn to document.getElementById('show-zoom-menu-btn')
+  if control is not null
+    remove .zoom-hidden from control
+    set localStorage['cv-zoom-visible'] to 'true'
+  end
+  if menuBtn is not null
+    add .zoom-hidden to menuBtn
+  end
+end
+
+-- Hide zoom control
+def hideZoomControl()
+  set control to document.getElementById('zoom-control')
+  set menuBtn to document.getElementById('show-zoom-menu-btn')
+  if control is not null
+    add .zoom-hidden to control
+    set localStorage['cv-zoom-visible'] to 'false'
+  end
   if menuBtn is not null
     remove .zoom-hidden from menuBtn
   end
 end
+
+-- Toggle zoom control visibility
+def toggleZoomControl()
+  set control to document.getElementById('zoom-control')
+  if control is not null
+    if control.classList.contains('zoom-hidden')
+      call showZoomControl()
+    else
+      call hideZoomControl()
+    end
+  end
+end