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Fix: TalklingHead2.animate crash "Cannot read properties of undefined (reading 'value')"

Root cause

In @met4citizen/talkinghead/dist/talkinghead.mjs, the animate() method crashes at line ~2620 when:

• this.mtRandomized contains morph target keys not present in this.mtAvatar for the loaded GLB
• j = this.mtAvatar[i] returns undefined → !j.needsUpdate throws

Fix (3 layers)

1. Null check in animate — add if (!j) continue; before null access
2. Guard direct .value accesses — wrap this.mtAvatar['key'].value in (this.mtAvatar['key'] || {}).value || 0
3. Wrap animate in try/catch — safety net for any other crashes

Patch is applied at Docker build-time via patch_talkinghead.py run after bun install.