feat: fix sync counters, polished activity rows, Files tab, new icon

- Fix SYNC_COMPLETED showing ↑0 ↓0 ✗0 when only deletions occurred: add ✕N
  for deleted files to the summary message (↑N ↓N ✕N ✗N format)
- Fix PairDetail Activity section showing raw "SYNC_STARTED" enum names and
  "remote" as a plain subtitle: replace dot-based EventRow with the same
  polished icon-bubble rows as the global Log tab
- Extract shared SyncEventRow composable + iconAndTint/label helpers to
  ui/shared/SyncEventRow.kt; both LogScreen and PairDetailScreen now use it
- Add Files tab (4th tab between Log and Accounts): folder browser showing
  all synced files per pair, grouped by subdirectory, with file-type icons,
  size, last-synced date, and a summary header (N files, total size)
- Add SyncFileStateDao.observeForPair() reactive Flow query for Files tab
- Completely redesign app icon: near-black radial gradient background with
  three bold directional arrows in an S-pattern (coral → silver → teal),
  each with gradient fills and tip-glow dots — entirely different from the
  typical circular sync-arrow style
- Bump version to 1.0.22 (build 23)

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

app/src/main/kotlin/com/syncflow/data/db/SyncFileStateDao.kt

@@ -2,9 +2,13 @@ package com.syncflow.data.db
 
 import androidx.room.*
 import com.syncflow.data.db.entities.SyncFileStateEntity
+import kotlinx.coroutines.flow.Flow
 
 @Dao
 interface SyncFileStateDao {
+    @Query("SELECT * FROM sync_file_states WHERE syncPairId = :pairId ORDER BY relativePath ASC")
+    fun observeForPair(pairId: Long): Flow<List<SyncFileStateEntity>>
+
     @Query("SELECT * FROM sync_file_states WHERE syncPairId = :pairId")
     suspend fun getForPair(pairId: Long): List<SyncFileStateEntity>