[Feature] Modern UI roll out (#236)

This PR moves all the collection pages into the new UI in a rough push.
I did not put the same amount of care into these as into search, index, and predict.

## Major changes

- All modals are now migrated to a state based alpine.js implementation.
- jQuery is no longer present in the base layout; ajax is replace by native fetch api
- most of the pps.js is now obsolte (as I understand it; the code is not referenced any more @jebus  please double check)
- in-memory pagination for large result lists (set to 50; we can make that configurable later; performance degrades at around 1k) stukk a bit rough tracked in #235

## Minor things

- Sarch and index also use alpine now
- The loading spinner is now CSS animated (not sure if it currently gets correctly called)

## Not done

- Ihave not even cheked the admin pages. Not sure If these need migrations
- The temporary migration pages still use the old template. Not sure what is supposed to happen with those? @jebus

## What I did to test

- opend all pages in browse, and user ; plus all pages reachable from there.
- Interacted and tested the functionality of each modal superfically with exception of the API key modal (no functional test).

---
This PR is massive sorry for that; just did not want to push half-brokenn state.
@jebus @liambrydon I would be glad if you could click around and try to break it :)

Finally closes #133

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#236
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

static/js/alpine/search.js

@@ -0,0 +1,145 @@
+/**
+ * Search Modal Alpine.js Component
+ *
+ * Provides package selection, search mode switching, and results display
+ * for the search modal.
+ */
+
+document.addEventListener('alpine:init', () => {
+  /**
+   * Search Modal Component
+   *
+   * Usage:
+   * <dialog x-data="searchModal()" @close="reset()">
+   *   ...
+   * </dialog>
+   */
+  Alpine.data('searchModal', () => ({
+    // Package selector state
+    selectedPackages: [],
+
+    // Search state
+    searchMode: 'text',
+    searchModeLabel: 'Text',
+    query: '',
+
+    // Results state
+    results: null,
+    isSearching: false,
+    error: null,
+
+    // Initialize on modal open
+    init() {
+      // Load reviewed packages by default
+      this.loadInitialSelection();
+
+      // Watch for modal open to focus searchbar
+      this.$watch('$el.open', (open) => {
+        if (open) {
+          setTimeout(() => {
+            this.$refs.searchbar.focus();
+          }, 320);
+        }
+      });
+    },
+
+    loadInitialSelection() {
+      // Select all reviewed packages by default
+      const menuItems = this.$refs.packageDropdown.querySelectorAll('li');
+
+      for (const item of menuItems) {
+        // Stop at 'Unreviewed Packages' section
+        if (item.classList.contains('menu-title') &&
+            item.textContent.trim() === 'Unreviewed Packages') {
+          break;
+        }
+
+        const packageOption = item.querySelector('.package-option');
+        if (packageOption) {
+          this.selectedPackages.push({
+            url: packageOption.dataset.packageUrl,
+            name: packageOption.dataset.packageName
+          });
+        }
+      }
+    },
+
+    togglePackage(url, name) {
+      const index = this.selectedPackages.findIndex(pkg => pkg.url === url);
+
+      if (index !== -1) {
+        this.selectedPackages.splice(index, 1);
+      } else {
+        this.selectedPackages.push({ url, name });
+      }
+    },
+
+    removePackage(url) {
+      const index = this.selectedPackages.findIndex(pkg => pkg.url === url);
+      if (index !== -1) {
+        this.selectedPackages.splice(index, 1);
+      }
+    },
+
+    isPackageSelected(url) {
+      return this.selectedPackages.some(pkg => pkg.url === url);
+    },
+
+    setSearchMode(mode, label) {
+      this.searchMode = mode;
+      this.searchModeLabel = label;
+      this.$refs.modeDropdown.hidePopover();
+    },
+
+    async performSearch(serverBase) {
+      if (!this.query.trim()) {
+        return;
+      }
+
+      if (this.selectedPackages.length < 1) {
+        this.results = { error: 'no_packages' };
+        return;
+      }
+
+      const params = new URLSearchParams();
+      this.selectedPackages.forEach(pkg => params.append('packages', pkg.url));
+      params.append('search', this.query.trim());
+      params.append('mode', this.searchModeLabel.toLowerCase());
+
+      this.isSearching = true;
+      this.results = null;
+      this.error = null;
+
+      try {
+        const response = await fetch(`${serverBase}/search?${params.toString()}`, {
+          method: 'GET',
+          headers: { 'Accept': 'application/json' }
+        });
+
+        if (!response.ok) {
+          throw new Error('Search request failed');
+        }
+
+        this.results = await response.json();
+      } catch (err) {
+        console.error('Search error:', err);
+        this.error = 'Search failed. Please try again.';
+      } finally {
+        this.isSearching = false;
+      }
+    },
+
+    hasResults() {
+      if (!this.results || this.results.error) return false;
+      const categories = ['Compounds', 'Compound Structures', 'Rules', 'Reactions', 'Pathways'];
+      return categories.some(cat => this.results[cat] && this.results[cat].length > 0);
+    },
+
+    reset() {
+      this.query = '';
+      this.results = null;
+      this.error = null;
+      this.isSearching = false;
+    }
+  }));
+});