feat(electrobun): file management — CodeMirror editor, PDF viewer, CSV table, real file I/O

- CodeEditor: CodeMirror 6 with Catppuccin theme, 15+ languages, Ctrl+S save,
  dirty tracking, save-on-blur
- PdfViewer: pdfjs-dist canvas rendering, zoom 0.5-3x, HiDPI, lazy page load
- CsvTable: RFC 4180 parser, delimiter auto-detect, sortable columns, sticky header
- FileBrowser: real filesystem via files.list/read/write RPC, lazy dir loading,
  file type routing (code→editor, pdf→viewer, csv→table, images→display)
- 10MB size gate, binary detection, base64 encoding for non-text files

ui-electrobun/src/bun/search-db.ts

@@ -0,0 +1,202 @@
+/**
+ * FTS5 full-text search database — bun:sqlite.
+ *
+ * Three virtual tables: search_messages, search_tasks, search_btmsg.
+ * Provides indexing and unified search across all tables.
+ * DB path: ~/.local/share/agor/search.db
+ */
+
+import { Database } from "bun:sqlite";
+import { homedir } from "os";
+import { mkdirSync } from "fs";
+import { join } from "path";
+
+// ── Types ────────────────────────────────────────────────────────────────────
+
+export interface SearchResult {
+  resultType: string;
+  id: string;
+  title: string;
+  snippet: string;
+  score: number;
+}
+
+// ── DB path ──────────────────────────────────────────────────────────────────
+
+const DATA_DIR = join(homedir(), ".local", "share", "agor");
+const DB_PATH = join(DATA_DIR, "search.db");
+
+// ── SearchDb class ───────────────────────────────────────────────────────────
+
+export class SearchDb {
+  private db: Database;
+
+  constructor(dbPath?: string) {
+    const path = dbPath ?? DB_PATH;
+    const dir = join(path, "..");
+    mkdirSync(dir, { recursive: true });
+
+    this.db = new Database(path);
+    this.db.run("PRAGMA journal_mode = WAL");
+    this.db.run("PRAGMA busy_timeout = 2000");
+    this.createTables();
+  }
+
+  private createTables(): void {
+    this.db.run(`
+      CREATE VIRTUAL TABLE IF NOT EXISTS search_messages USING fts5(
+        session_id,
+        role,
+        content,
+        timestamp
+      )
+    `);
+    this.db.run(`
+      CREATE VIRTUAL TABLE IF NOT EXISTS search_tasks USING fts5(
+        task_id,
+        title,
+        description,
+        status,
+        assigned_to
+      )
+    `);
+    this.db.run(`
+      CREATE VIRTUAL TABLE IF NOT EXISTS search_btmsg USING fts5(
+        message_id,
+        from_agent,
+        to_agent,
+        content,
+        channel_name
+      )
+    `);
+  }
+
+  /** Index an agent message. */
+  indexMessage(sessionId: string, role: string, content: string): void {
+    const ts = new Date().toISOString();
+    this.db.run(
+      "INSERT INTO search_messages (session_id, role, content, timestamp) VALUES (?, ?, ?, ?)",
+      [sessionId, role, content, ts],
+    );
+  }
+
+  /** Index a task. */
+  indexTask(taskId: string, title: string, description: string, status: string, assignedTo: string): void {
+    this.db.run(
+      "INSERT INTO search_tasks (task_id, title, description, status, assigned_to) VALUES (?, ?, ?, ?, ?)",
+      [taskId, title, description, status, assignedTo],
+    );
+  }
+
+  /** Index a btmsg message. */
+  indexBtmsg(msgId: string, fromAgent: string, toAgent: string, content: string, channel: string): void {
+    this.db.run(
+      "INSERT INTO search_btmsg (message_id, from_agent, to_agent, content, channel_name) VALUES (?, ?, ?, ?, ?)",
+      [msgId, fromAgent, toAgent, content, channel],
+    );
+  }
+
+  /** Search across all FTS5 tables. */
+  searchAll(query: string, limit = 20): SearchResult[] {
+    if (!query.trim()) return [];
+
+    const results: SearchResult[] = [];
+
+    // Search messages
+    try {
+      const msgRows = this.db
+        .prepare(
+          `SELECT session_id, role,
+                  snippet(search_messages, 2, '<b>', '</b>', '...', 32) as snip,
+                  rank
+           FROM search_messages
+           WHERE search_messages MATCH ?
+           ORDER BY rank
+           LIMIT ?`,
+        )
+        .all(query, limit) as Array<{ session_id: string; role: string; snip: string; rank: number }>;
+
+      for (const row of msgRows) {
+        results.push({
+          resultType: "message",
+          id: row.session_id,
+          title: row.role,
+          snippet: row.snip ?? "",
+          score: Math.abs(row.rank ?? 0),
+        });
+      }
+    } catch {
+      // FTS5 syntax error — skip messages
+    }
+
+    // Search tasks
+    try {
+      const taskRows = this.db
+        .prepare(
+          `SELECT task_id, title,
+                  snippet(search_tasks, 2, '<b>', '</b>', '...', 32) as snip,
+                  rank
+           FROM search_tasks
+           WHERE search_tasks MATCH ?
+           ORDER BY rank
+           LIMIT ?`,
+        )
+        .all(query, limit) as Array<{ task_id: string; title: string; snip: string; rank: number }>;
+
+      for (const row of taskRows) {
+        results.push({
+          resultType: "task",
+          id: row.task_id,
+          title: row.title,
+          snippet: row.snip ?? "",
+          score: Math.abs(row.rank ?? 0),
+        });
+      }
+    } catch {
+      // FTS5 syntax error — skip tasks
+    }
+
+    // Search btmsg
+    try {
+      const btmsgRows = this.db
+        .prepare(
+          `SELECT message_id, from_agent,
+                  snippet(search_btmsg, 3, '<b>', '</b>', '...', 32) as snip,
+                  rank
+           FROM search_btmsg
+           WHERE search_btmsg MATCH ?
+           ORDER BY rank
+           LIMIT ?`,
+        )
+        .all(query, limit) as Array<{ message_id: string; from_agent: string; snip: string; rank: number }>;
+
+      for (const row of btmsgRows) {
+        results.push({
+          resultType: "btmsg",
+          id: row.message_id,
+          title: row.from_agent,
+          snippet: row.snip ?? "",
+          score: Math.abs(row.rank ?? 0),
+        });
+      }
+    } catch {
+      // FTS5 syntax error — skip btmsg
+    }
+
+    // Sort by score (lower = more relevant for FTS5 rank)
+    results.sort((a, b) => a.score - b.score);
+    return results.slice(0, limit);
+  }
+
+  /** Drop and recreate all FTS5 tables. */
+  rebuildIndex(): void {
+    this.db.run("DROP TABLE IF EXISTS search_messages");
+    this.db.run("DROP TABLE IF EXISTS search_tasks");
+    this.db.run("DROP TABLE IF EXISTS search_btmsg");
+    this.createTables();
+  }
+
+  close(): void {
+    this.db.close();
+  }
+}