App crashes when total terminal count exceeds ~4 across tabs (WebGL context exhaustion)

[Axelj00]

Description

The app crashes when the total number of terminal panes across all tabs exceeds approximately 4-6. The maxPanes config is enforced per-tab (capped at 4), but there is no global limit across tabs.

Reproduction

1. Open 2 tabs, each with 2 split panes (4 terminals total — works fine)
2. Create a 3rd tab and split it into 2 panes (6 terminals total)
3. App crashes

Root Cause

Each Pane loads a WebglAddon for xterm.js rendering, consuming a GPU WebGL context. Hidden tabs do not release their WebGL contexts when switched away from (the addon stays loaded). Tauri's WebKit webview has a lower WebGL context limit than Chromium (~8-16), so 6+ simultaneous contexts can exhaust the limit.

The try/catch in pane.ts:289-304 handles WebGL loading failures gracefully, but does not protect against mid-session context exhaustion or native-layer crashes.

Possible Fixes

• Dispose WebGL addon on tab.hide() and re-create it on tab.show() — keeps only the active tab's panes using WebGL
• Add a global pane counter that caps total panes across all tabs (not just per-tab)
• Lazy-load WebGL only for the active tab, fall back to canvas renderer for background tabs
• Dispose the ImageAddon on hidden tabs as well (it may also consume a WebGL context)

Environment

• macOS (Darwin 25.1.0)
• Tauri v2 (WebKit webview)

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Reported by @axel

[Axelj00]

Fixed in 5a65b05 — WebGL addons are now disposed on tab hide and re-created on show, preventing GPU context exhaustion