feat(search): add scope, source, follows, sort toggles + bech32 auto-resolve (Android)

Android search previously dumped users, notes, hashtags, relays, and 3 channel
types into a single untoggled list and silently relied on NIP-50 relay search.
This adds a second-row control strip so users can pick what they're looking for
and how results are sourced/ranked.

Commons:
- New SearchScope { ALL, PEOPLE, NOTES } and SearchSource { LOCAL, RELAYS }
- SearchSortOrder: add POPULAR; EVENT_OPTIONS now [RELEVANCE, NEWEST, POPULAR]

Android SearchBarViewModel:
- scope / source / followsOnly / sortOrder StateFlows
- searchResultsUsers + searchResultsNotes respect scope, follows, and sort
- POPULAR sorts notes by Note.zapsAmount (descending)
- Follows-only filters authors (includes replies since filter is by author)
- directEventResolver: bech32 nevent/note/naddr -> Route.Note (auto-navigate)
- updateDataSource skips relay emit when source == LOCAL

Android SearchScreen:
- Second row: [All | People | Notes] SegmentedButton + Sort dropdown
- Third row: [Local | Relays] SegmentedButton + Follows-only chip
- bech32 hit triggers nav.nav(route) and clears the search

Desktop parity deferred - Desktop already ships an advanced panel that covers
most of this (kinds/authors/dates/hashtags/language/exclude terms + sort +
bech32 direct lookup). The new enums live in commons so Desktop can adopt.

Build note: gradle 9.3.1 can't be downloaded in this environment, so Android
and Desktop compilation were not verified here.

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/search/SearchResultSorter.kt

@@ -48,6 +48,12 @@ object SearchResultSorter {
                 }
             }
 
+            SearchSortOrder.POPULAR -> {
+                // Raw Event has no zap-total; callers that hold Note objects should sort by
+                // zapsAmount directly. Fall back to newest so the option is still harmless here.
+                events.sortedWith(compareByDescending<Event> { it.createdAt }.thenBy { it.id })
+            }
+
             else -> {
                 events
             }

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/search/SearchScope.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.commons.search
+
+enum class SearchScope {
+    ALL,
+    PEOPLE,
+    NOTES,
+}

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/search/SearchSortOrder.kt

@@ -26,12 +26,13 @@ enum class SearchSortOrder(
     NEWEST("Newest"),
     OLDEST("Oldest"),
     RELEVANCE("Relevance"),
+    POPULAR("Popular"),
     NAME_AZ("A → Z"),
     NAME_ZA("Z → A"),
     ;
 
     companion object {
-        val EVENT_OPTIONS = listOf(NEWEST, OLDEST, RELEVANCE)
+        val EVENT_OPTIONS = listOf(RELEVANCE, NEWEST, POPULAR)
         val PEOPLE_OPTIONS = listOf(NAME_AZ, NAME_ZA)
         val DEFAULT_EVENT = NEWEST
         val DEFAULT_PEOPLE = NAME_AZ

commons/src/commonMain/kotlin/com/vitorpamplona/amethyst/commons/search/SearchSource.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.commons.search
+
+enum class SearchSource {
+    LOCAL,
+    RELAYS,
+}