fix(session): auto-reconnect WebSocket with backoff and ticket refresh (#18)

[Aduersarius]

Closes #18

Summary

Adds automatic WebSocket reconnection when the game socket drops, without requiring a full page reload or character re-select.

Approach

• Hook-level reconnect in useGameSession.ts: exponential backoff (1s → 2s → … capped at 30s, max 6 attempts), no reconnect storm while the server is down.
• Full handshake on resume: each attempt re-sends connectCharacter and refreshes the game/arena ticket via refreshConnectionCredentials (tickets can expire).
• Background / network recovery: visibilitychange, pageshow, pagehide, and online trigger a wake reconnect when returning from background or regaining network.
• Visible connection state on the play page: countdown while scheduled, cancel during reconnect, manual Reconectar when attempts are exhausted or cancelled.
• Intentional closes (closeForce / logout teardown) do not auto-reconnect.

Files

• frontend/components/game/session/useGameSession.ts
• frontend/components/game/core/MapRendererCore.tsx (prop/status wiring only)
• frontend/app/play/page.tsx (ticket refresh + reconnect UI)

Acceptance

• Network drop then restore reconnects without full page reload
• Returning from background reconnects
• Server down → exponential backoff, no reconnect storm
• Visible connection state (+ cancel / manual reconnect when exhausted)
• Same character preserved; full handshake + ticket refresh

Differentiation vs open PRs

• Add automatic game reconnect flow #39: large page-orchestrated flow + MapRenderer status flag; this keeps orchestration in the session hook with a thin play-page UI/ticket refresh.
• feat(frontend): improve disconnection recovery and automatic reconnection flow (#18) #53: message-only + unrelated server idle/CGNAT changes; this implements real reconnect.
• fix(session): WebSocket auto-reconnect with exponential backoff (#18) #125 / fix(session): WebSocket auto-reconnect with exponential backoff (#18) #116: hook backoff but reuse possibly expired tickets and/or omit cancel+manual UI / pagehide; fix(session): WebSocket auto-reconnect with exponential backoff (#18) #125 also adds unrelated npcs.json. This PR refreshes tickets, adds cancel/manual controls, and avoids unrelated file churn.

Test plan

• Connect to play, kill network briefly, restore → auto-reconnect + same character
• Background the tab/app, return → reconnect without reload
• Stop game server → spaced attempts, then Reconectar after exhausted
• Cancelar reconexion stops further attempts
• Arena room path regenerates ticket on reconnect

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