fix: sourceUser should be object {username, date} not string

Was setting sourceUser to result.sourceUser.username (string)
Should be result.sourceUser (SourceUser object)

This caused:
- useSearch to call batch.map(r => r.sourceUser.username) on strings
- .username on string returns undefined
- batch-search-actors received null values
- ValidationError: expected string, received null

Also caused localeCompare error when sorting undefined values.

docs/git-history.json

···
     "files_changed": 5
   },
   {
-    "hash": "b6b8c3968bbe1d71e38d2acbea3f31c77f08656a",
-    "short_hash": "b6b8c39",
+    "hash": "6ced3f0b015af1c9126559a393996576402cfd03",
+    "short_hash": "6ced3f0",
     "author": "Ariel M. Lighty",
-    "date": "2025-12-26T13:52:59-05:00",
-    "message": "fix: correct function name to handleLoadUpload in uploadId useEffect",
-    "files_changed": 3
+    "date": "2025-12-26T14:12:46-05:00",
+    "message": "fix extension flow: create user_source_follows, auto-search, time display\n\nBackend (extension-import.ts):\n- Now creates user_source_follows entries linking upload to source accounts\n- Without these, get-upload-details returned empty (queries FROM user_source_follows)\n- Uses bulkCreate return value (Map<username, id>) to create links\n\nFrontend (App.tsx):\n- handleLoadUpload now detects if upload has no matches yet\n- Sets isSearching: true for new uploads\n- Automatically triggers searchAllUsers for new uploads\n- Saves results after search completes\n- Changed platform from hardcoded \"tiktok\" to \"twitter\"\n\nFrontend (HistoryTab.tsx):\n- Fixed time display: removed \"Uploaded\" prefix\n- Now shows \"about 5 hours ago\" instead of \"Uploaded in about 5 hours\"\n- formatRelativeTime with addSuffix already provides complete sentence\n\nResolves:\n- Empty results on page load\n- No automatic searching\n- History navigation not working (will work after search)\n- Grammatically incorrect time display",
+    "files_changed": 5
   },
   {
     "hash": "581ed00fec3c0c5f472c6ff92e00bf4ed5b27e9a",
···
     "files_changed": 2
   },
   {
-    "hash": "a203bc343b1768cd51e08b51ed296eddb51d21b7",
-    "short_hash": "a203bc3",
+    "hash": "95636330f387598f55017eda668fb9f91ccde509",
+    "short_hash": "9563633",
     "author": "Ariel M. Lighty",
-    "date": "2025-12-26T00:50:44-05:00",
-    "message": "update documentation with current debugging status\n\nPLAN.md updates:\n- Added current status section with recent fixes and active work\n- Marked Phase 0 as complete\n- Marked Phase 1 as in progress (debugging)\n- Updated changelog with 2025-12-26 progress\n- Updated decision graph count to 288 nodes\n\nEXTENSION_STATUS.md updates:\n- Changed state from READY FOR TESTING to DEBUGGING\n- Added fixed issues section (NaN bug, database init)\n- Added active debugging section\n- Updated decision graph summary to 288 nodes\n- Added node references for recent fixes (#287-288)\n\nDecision graph:\n- Synced with latest nodes (288 total, 276 edges)\n- Tracked database initialization outcome",
-    "files_changed": 4
+    "date": "2025-12-26T13:35:52-05:00",
+    "message": "fix extension api-client: unwrap ApiResponse.data structure\n\nBackend endpoints use successResponse() which wraps data in:\n  { success: true, data: {...} }\n\nExtension was expecting flat response structure, causing:\n- uploadToATlast to return undefined (missing importId, redirectUrl)\n- checkSession to return wrapped object instead of user data\n- Invalid URL error: \"http://127.0.0.1:8888undefined\"\n\nFixed both uploadToATlast and checkSession to access apiResponse.data",
+    "files_changed": 2
   },
   {
     "hash": "34bd9dcd1237971a87627b148c0452b8484e4871",
···
     "files_changed": 3
   },
   {
-    "hash": "32cdee3aeac7ef986df47e0fff786b5f7471e55b",
-    "short_hash": "32cdee3",
+    "hash": "ba29fd68872913ba0a587aa7f29f97b3d373a732",
+    "short_hash": "ba29fd6",
     "author": "Ariel M. Lighty",
     "date": "2025-12-25T13:22:32-05:00",
     "message": "configure Netlify dev for monorepo with --filter flag\n\nFixed Netlify CLI monorepo detection issue by using --filter flag:\n- Updated root package.json scripts to use 'npx netlify-cli dev --filter @atlast/web'\n- Updated netlify.toml [dev] section to use npm with --prefix for framework command\n- Added monorepo development instructions to CLAUDE.md\n- Documented Windows Git Bash compatibility issue with netlify command\n\nSolution: Use 'npx netlify-cli dev --filter @atlast/web' to bypass monorepo\nproject selection prompt and specify which workspace package to run.\n\nDev server now runs successfully at http://localhost:8888 with all backend\nfunctions loaded.",
-    "files_changed": 4
+    "files_changed": 5
   },
   {
-    "hash": "ba29fd68872913ba0a587aa7f29f97b3d373a732",
-    "short_hash": "ba29fd6",
+    "hash": "32cdee3aeac7ef986df47e0fff786b5f7471e55b",
+    "short_hash": "32cdee3",
     "author": "Ariel M. Lighty",
     "date": "2025-12-25T13:22:32-05:00",
     "message": "configure Netlify dev for monorepo with --filter flag\n\nFixed Netlify CLI monorepo detection issue by using --filter flag:\n- Updated root package.json scripts to use 'npx netlify-cli dev --filter @atlast/web'\n- Updated netlify.toml [dev] section to use npm with --prefix for framework command\n- Added monorepo development instructions to CLAUDE.md\n- Documented Windows Git Bash compatibility issue with netlify command\n\nSolution: Use 'npx netlify-cli dev --filter @atlast/web' to bypass monorepo\nproject selection prompt and specify which workspace package to run.\n\nDev server now runs successfully at http://localhost:8888 with all backend\nfunctions loaded.",
-    "files_changed": 5
+    "files_changed": 4
   },
   {
     "hash": "c3e7afad396d130791d801a85cbfc9643bcd6309",

docs/graph-data.json

···
       "created_at": "2025-12-26T16:08:24.248208800-05:00",
       "updated_at": "2025-12-26T16:08:24.248208800-05:00",
       "metadata_json": "{\"branch\":\"master\",\"confidence\":95}"
+    },
+    {
+      "id": 314,
+      "change_id": "6837403f-1e30-4a71-bcf5-71db0cac6afc",
+      "node_type": "goal",
+      "title": "Fix validation error and undefined localeCompare in extension flow",
+      "description": null,
+      "status": "pending",
+      "created_at": "2025-12-26T20:17:59.516959100-05:00",
+      "updated_at": "2025-12-26T20:17:59.516959100-05:00",
+      "metadata_json": "{\"branch\":\"master\",\"confidence\":90}"
+    },
+    {
+      "id": 315,
+      "change_id": "a08d22fc-5970-4a5d-8454-4a1ef2efc7e4",
+      "node_type": "observation",
+      "title": "Two errors: 1) batch-search-actors gets null in usernames array, 2) Frontend localeCompare on undefined - likely wrong SearchResult structure",
+      "description": null,
+      "status": "pending",
+      "created_at": "2025-12-26T20:18:03.693879700-05:00",
+      "updated_at": "2025-12-26T20:18:03.693879700-05:00",
+      "metadata_json": "{\"branch\":\"master\",\"confidence\":95}"
+    },
+    {
+      "id": 316,
+      "change_id": "58ef0c82-402c-4fff-8421-83c5417475b1",
+      "node_type": "action",
+      "title": "Fix SearchResult structure - sourceUser should be object not string",
+      "description": null,
+      "status": "pending",
+      "created_at": "2025-12-26T20:19:47.621459800-05:00",
+      "updated_at": "2025-12-26T20:19:47.621459800-05:00",
+      "metadata_json": "{\"branch\":\"master\",\"confidence\":95}"
+    },
+    {
+      "id": 317,
+      "change_id": "3a24a4a2-b4d0-4629-a29b-b33994d50e75",
+      "node_type": "outcome",
+      "title": "Fixed SearchResult structure - sourceUser is now correct SourceUser object instead of string",
+      "description": null,
+      "status": "pending",
+      "created_at": "2025-12-26T20:20:22.507291300-05:00",
+      "updated_at": "2025-12-26T20:20:22.507291300-05:00",
+      "metadata_json": "{\"branch\":\"master\",\"confidence\":95}"
     }
   ],
   "edges": [
···
       "weight": 1.0,
       "rationale": "Implementation complete",
       "created_at": "2025-12-26T16:08:26.942822600-05:00"
+    },
+    {
+      "id": 304,
+      "from_node_id": 313,
+      "to_node_id": 314,
+      "from_change_id": "5fae9da8-2a31-4f99-9686-7bfb28c443e8",
+      "to_change_id": "6837403f-1e30-4a71-bcf5-71db0cac6afc",
+      "edge_type": "leads_to",
+      "weight": 1.0,
+      "rationale": "New errors found",
+      "created_at": "2025-12-26T20:18:01.626612100-05:00"
+    },
+    {
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+      "from_node_id": 314,
+      "to_node_id": 315,
+      "from_change_id": "6837403f-1e30-4a71-bcf5-71db0cac6afc",
+      "to_change_id": "a08d22fc-5970-4a5d-8454-4a1ef2efc7e4",
+      "edge_type": "leads_to",
+      "weight": 1.0,
+      "rationale": "Initial analysis",
+      "created_at": "2025-12-26T20:18:45.898518700-05:00"
+    },
+    {
+      "id": 306,
+      "from_node_id": 315,
+      "to_node_id": 316,
+      "from_change_id": "a08d22fc-5970-4a5d-8454-4a1ef2efc7e4",
+      "to_change_id": "58ef0c82-402c-4fff-8421-83c5417475b1",
+      "edge_type": "leads_to",
+      "weight": 1.0,
+      "rationale": "Fix identified",
+      "created_at": "2025-12-26T20:19:50.103362300-05:00"
+    },
+    {
+      "id": 307,
+      "from_node_id": 316,
+      "to_node_id": 317,
+      "from_change_id": "58ef0c82-402c-4fff-8421-83c5417475b1",
+      "to_change_id": "3a24a4a2-b4d0-4629-a29b-b33994d50e75",
+      "edge_type": "leads_to",
+      "weight": 1.0,
+      "rationale": "Implementation complete",
+      "created_at": "2025-12-26T20:20:24.693529800-05:00"
+    },
+    {
+      "id": 308,
+      "from_node_id": 314,
+      "to_node_id": 317,
+      "from_change_id": "6837403f-1e30-4a71-bcf5-71db0cac6afc",
+      "to_change_id": "3a24a4a2-b4d0-4629-a29b-b33994d50e75",
+      "edge_type": "leads_to",
+      "weight": 1.0,
+      "rationale": "Goal achieved",
+      "created_at": "2025-12-26T20:20:26.885283800-05:00"
     }
   ]
 }

packages/web/src/App.tsx

···
         const hasMatches = data.results.some(r => r.atprotoMatches.length > 0);
 
         const loadedResults: SearchResult[] = data.results.map((result) => ({
-          sourceUser: result.sourceUser.username,
+          sourceUser: result.sourceUser, // SourceUser object { username, date }
           sourcePlatform: platform,
           isSearching: !hasMatches, // Search if no matches exist yet
           atprotoMatches: result.atprotoMatches || [],