feat: Merge economy and rounds pages with unified economy utilities

- Create economyUtils.ts with team-aware buy type classification
  (CT has higher thresholds due to M4 cost)
- Add Economy Overview toggle to rounds page with charts
- Resolve player names/avatars in round economy display
- Remove standalone Economy tab (merged into Rounds)
- Document missing backend API data (round winner, win reason)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

MISSING_BACKEND_API.md

@@ -0,0 +1,107 @@
+# Missing Backend API Data
+
+This document outlines data that the frontend is ready to display but is not currently provided by the backend API. These features would enhance the match analysis experience.
+
+## Round Winner & Win Reason
+
+**Endpoint**: `GET /match/{id}/rounds`
+
+**Currently Returns**:
+
+```json
+{
+  "0": { "player_id": [bank, equipment, spent] },
+  "1": { "player_id": [bank, equipment, spent] }
+}
+```
+
+**Missing Fields Needed**:
+
+| Field        | Type     | Description                            |
+| ------------ | -------- | -------------------------------------- |
+| `winner`     | `number` | Team ID that won the round (1=T, 2=CT) |
+| `win_reason` | `string` | How the round ended                    |
+
+**Win Reason Values**:
+
+- `elimination` - All enemies killed
+- `bomb_defused` - CT defused the bomb
+- `bomb_exploded` - Bomb detonated successfully
+- `time` - Round timer expired (CT win)
+- `target_saved` - Hostage rescued (rare mode)
+
+**Expected Response Format**:
+
+```json
+{
+  "0": {
+    "winner": 1,
+    "win_reason": "elimination",
+    "players": {
+      "player_id": [bank, equipment, spent]
+    }
+  }
+}
+```
+
+**Implementation**: Demo parser needs to capture `RoundEnd` game events and extract:
+
+- `winner` field from the event
+- `reason` field from the event
+
+---
+
+## Per-Round Player Stats
+
+**Missing Fields per Player per Round**:
+
+| Field              | Type     | Description                                  |
+| ------------------ | -------- | -------------------------------------------- |
+| `kills_in_round`   | `number` | Kills this player got in this specific round |
+| `damage_in_round`  | `number` | Total damage dealt this round                |
+| `assists_in_round` | `number` | Assists this round                           |
+
+**Implementation**: During demo parse, aggregate `player_death` and `player_hurt` events per round, grouped by attacking player.
+
+---
+
+## Loss Bonus Tracking
+
+**Missing Fields per Team per Round**:
+
+| Field         | Type     | Description                    |
+| ------------- | -------- | ------------------------------ |
+| `loss_streak` | `number` | Consecutive round losses (0-4) |
+| `loss_bonus`  | `number` | Current loss bonus amount      |
+
+**CS2 Loss Bonus Scale**:
+| Consecutive Losses | Bonus |
+|-------------------|-------|
+| 0 | $1,400 |
+| 1 | $1,900 |
+| 2 | $2,400 |
+| 3 | $2,900 |
+| 4+ | $3,400 |
+
+**Implementation**: Track `RoundEnd` events and maintain loss counter per team, resetting on win.
+
+---
+
+## Frontend Readiness
+
+The frontend already has:
+
+- Type definitions for all missing fields (`src/lib/types/RoundStats.ts`)
+- Zod validation schemas (`src/lib/schemas/roundStats.schema.ts`)
+- UI components ready to display win reasons with icons
+- Mock handlers showing expected data structure (`src/mocks/handlers/matches.ts`)
+
+Once the backend provides this data, the frontend will automatically display it.
+
+---
+
+## Priority
+
+1. **High**: Round winner & win reason - enables win/loss correlation analysis
+2. **Medium**: Per-round player stats - enables round-by-round performance tracking
+3. **Low**: Loss bonus tracking - nice-to-have for economy analysis