feat(renderer): interactive table with sort, filter & CSV export (M10.9)

- InteractiveTable.vue: sortable columns, row filter, CSV export
- Extracts markdown tables from AI responses into structured data
- Click column header to sort (asc/desc), numeric-aware
- Filter input for live row filtering
- Renders alongside regular chat markdown

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

packages/app/src/composables/useTableExtractor.ts

@@ -0,0 +1,49 @@
+/**
+ * Extract markdown tables from text into structured data
+ * for interactive table rendering.
+ */
+
+export interface TableData {
+  headers: string[]
+  rows: string[][]
+  raw: string
+}
+
+// Matches a markdown table: header row, separator row, data rows
+const TABLE_RE = /^(\|[^\n]+\|)\n(\|[\s:|-]+\|)\n((?:\|[^\n]+\|\n?)+)/gm
+
+export function extractTables(text: string): TableData[] {
+  const results: TableData[] = []
+  let m: RegExpExecArray | null
+  const re = new RegExp(TABLE_RE.source, TABLE_RE.flags)
+
+  while ((m = re.exec(text)) !== null) {
+    const headerLine = m[1]
+    const dataBlock = m[3]
+
+    const headers = parseRow(headerLine)
+    const rows = dataBlock
+      .trim()
+      .split('\n')
+      .map(parseRow)
+      .filter((r) => r.length > 0)
+
+    if (headers.length > 0 && rows.length > 0) {
+      results.push({ headers, rows, raw: m[0] })
+    }
+  }
+
+  return results
+}
+
+function parseRow(line: string): string[] {
+  return line
+    .replace(/^\|/, '')
+    .replace(/\|$/, '')
+    .split('|')
+    .map((cell) => cell.trim())
+}
+
+export function hasTables(text: string): boolean {
+  return TABLE_RE.test(text)
+}