Add component usage report

docs/component-usage-report.md

@@ -0,0 +1,62 @@
+# Component Usage Report
+
+## Method
+Scanned JSX tags in `src/**/*.tsx` and `src/**/*.jsx` using the regex `<[A-Z][A-Za-z0-9_]*` to count component usage occurrences.
+
+### Command
+```bash
+python - <<'PY'
+import json, re
+from pathlib import Path
+src = Path('src')
+pattern = re.compile(r'<([A-Z][A-Za-z0-9_]*)\\b')
+counts = {}
+files = list(src.rglob('*.tsx')) + list(src.rglob('*.jsx'))
+for path in files:
+    text = path.read_text(encoding='utf-8')
+    for match in pattern.findall(text):
+        counts[match] = counts.get(match, 0) + 1
+
+json_list = json.loads(Path('json-components-list.json').read_text(encoding='utf-8'))
+json_supported = {item['type'] for item in json_list if item.get('status') == 'supported'}
+json_planned = {item['type'] for item in json_list if item.get('status') == 'planned'}
+subcomponents = {}
+for item in json_list:
+    if item.get('status') == 'supported':
+        for sub in item.get('subComponents', []) or []:
+            subcomponents[sub] = item['type']
+
+sorted_counts = sorted(counts.items(), key=lambda x: x[1], reverse=True)
+not_supported = [(n, c) for n, c in sorted_counts if n not in json_supported and n not in subcomponents]
+print(sorted_counts[:10])
+print(not_supported[:10])
+PY
+```
+
+## Top 10 Components by Usage
+| Rank | Component | Usage Count | JSON Status |
+| --- | --- | --- | --- |
+| 1 | Button | 215 | supported |
+| 2 | Card | 172 | supported |
+| 3 | CardContent | 123 | supported (subcomponent of Card) |
+| 4 | Label | 105 | supported |
+| 5 | Badge | 102 | supported |
+| 6 | CardHeader | 101 | supported (subcomponent of Card) |
+| 7 | CardTitle | 100 | supported (subcomponent of Card) |
+| 8 | Stack | 95 | supported |
+| 9 | Text | 82 | supported |
+| 10 | Input | 66 | supported |
+
+## Top 10 Components Not Yet Supported (for conversion priority)
+| Rank | Component | Usage Count | JSON Status |
+| --- | --- | --- | --- |
+| 1 | SelectItem | 48 | not-listed |
+| 2 | Database | 39 | not-listed |
+| 3 | CheckCircle | 39 | not-listed |
+| 4 | ScrollArea | 34 | not-listed |
+| 5 | Trash | 33 | not-listed |
+| 6 | Plus | 28 | not-listed |
+| 7 | DialogContent | 20 | not-listed |
+| 8 | DialogHeader | 20 | not-listed |
+| 9 | DialogTitle | 20 | not-listed |
+| 10 | Tooltip | 20 | not-listed |