Add Location toggle-off fix + INSPIRE HILUCS workshop PPTX

- Default interaction mode changed from 'addLocation' to 'none' so that
  opening the app does not silently arm the Add-Location cursor; users
  must explicitly click the Add button to enter that mode.
- Add button now toggles: a second click returns to 'none' mode, matching
  the behaviour of the Measure and Draw buttons.
- All other tool buttons (Circle, Line, Area, Draw) now return to 'none'
  on toggle-off instead of re-activating Add-Location.
- Removed the hard-coded 'active' CSS class from the Add button in
  index.html, consistent with the new default state.

- Added INSPIRE_HILUCS_Workshop.pptx (13 slides) as a workshop reference
  deck covering INSPIRE Land Use Data Specifications, the HILUCS hierarchy
  (3 levels, 13 top-level classes), example HILUCS↔LUPMIS2 zone-code
  mappings, and a structured PROs/CONs analysis for LUSPA adoption,
  including a pragmatic localisation recommendation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

index.html

@@ -1689,7 +1689,7 @@
 
         <!-- Bottom Dock -->
         <div class="bottom-dock">
-          <button class="dock-btn active" type="button" id="dock-btn-add-location" title="Add Location Mode">
+          <button class="dock-btn" type="button" id="dock-btn-add-location" title="Add Location Mode">
             <span>📍</span>
             <span class="dock-btn-label">Add</span>
         </button>

main.js

@@ -140,10 +140,14 @@ let embedBridge = null;
 const EMBED_CONFIG = (typeof window !== 'undefined' && window.LUPMIS_EMBED) || null;
 const IS_EMBED_PERMIT = !!(EMBED_CONFIG && EMBED_CONFIG.mode === 'permit');
 
-// Current interaction mode: 'addLocation' | 'measureCircle' | 'measureLine' | 'measureArea'
-// In embed permit mode we don't want the default Add-Location click to fire,
-// so start the mode in a neutral state.
-let currentMode = IS_EMBED_PERMIT ? 'embed-permit' : 'addLocation';
+// Current interaction mode: 'none' | 'addLocation' | 'measureCircle' |
+// 'measureLine' | 'measureArea' | 'draw' | 'embed-permit'.
+// Default is 'none' — a neutral state where map clicks do not trigger
+// the Add-Location popup. Users explicitly opt into Add-Location by
+// pressing the Add button in the bottom dock; pressing it again toggles
+// the mode back off. Measurement / Draw tools also return to 'none'
+// when toggled off, rather than implicitly re-entering Add-Location.
+let currentMode = IS_EMBED_PERMIT ? 'embed-permit' : 'none';
 
 // ============================================================================
 // Application Initialization
@@ -705,11 +709,18 @@ function initUI() {
     }
   };
 
-  // Add Location mode button
+  // Add Location mode button — toggles. Clicking it once activates the
+  // mode (subsequent map-clicks open the Add-Location popup); clicking it
+  // again returns to the neutral 'none' mode so accidental map taps don't
+  // trigger the popup.
   if (addLocationBtn) {
     addLocationBtn.addEventListener('click', () => {
-      console.log('[Button] Add Location clicked');
-      setMode('addLocation', addLocationBtn);
+      console.log('[Button] Add Location clicked, currentMode is:', currentMode);
+      if (currentMode === 'addLocation') {
+        setMode('none', null);                  // toggle off
+      } else {
+        setMode('addLocation', addLocationBtn); // activate
+      }
     });
   }
 
@@ -718,8 +729,9 @@ function initUI() {
     measureCircleBtn.addEventListener('click', () => {
       console.log('[Button] Circle clicked, currentMode is:', currentMode);
       if (currentMode === 'measureCircle') {
-        // Toggle off - return to addLocation mode
-        setMode('addLocation', addLocationBtn);
+        // Toggle off — return to the neutral 'none' mode (no implicit
+        // Add-Location re-activation).
+        setMode('none', null);
       } else {
         setMode('measureCircle', measureCircleBtn);
 }
@@ -731,7 +743,7 @@ function initUI() {
     measureLineBtn.addEventListener('click', () => {
       console.log('[Button] Line clicked, currentMode is:', currentMode);
       if (currentMode === 'measureLine') {
-        setMode('addLocation', addLocationBtn);
+        setMode('none', null);
       } else {
         setMode('measureLine', measureLineBtn);
       }
@@ -743,7 +755,7 @@ function initUI() {
     measureAreaBtn.addEventListener('click', () => {
       console.log('[Button] Area clicked, currentMode is:', currentMode);
       if (currentMode === 'measureArea') {
-        setMode('addLocation', addLocationBtn);
+        setMode('none', null);
       } else {
         setMode('measureArea', measureAreaBtn);
       }
@@ -755,7 +767,7 @@ function initUI() {
     drawBtn.addEventListener('click', () => {
       console.log('[Button] Draw clicked, currentMode is:', currentMode);
       if (currentMode === 'draw') {
-        setMode('addLocation', addLocationBtn);
+        setMode('none', null);
       } else {
         setMode('draw', drawBtn);
       }