Add upper Table Mode center fade

[2sem]

Summary

• apply the same center-edge scroll fade layout to the upper THEM panel as the input panel
• keep the THEM language pill overlaid above the center divider so translated text can fade behind it instead of hard clipping
• preserve existing input-side bottom fade and Speak button margin behavior

User flow

flowchart TD
    A[Open Table Mode] --> B[Upper THEM panel]
    B --> C[Translated text scrolls/fills panel]
    C --> D[Text approaches center language pill]
    D --> E[Text fades under THEM pill near center]
    A --> F[Lower YOU panel keeps existing fade]

Loading

Verification

• Visual review on iPhone 11 Pro Max simulator: /var/folders/6x/l8h411bn30xd7f7ptkpc48mr0000gn/T/opencode/table-mode-upper-center-fade.png
• mise x -- tuist build
• mise x -- tuist test
• git diff --check

Release / rollback

• UI-only Table Mode layout/masking change.
• Roll back by reverting this PR if translated text positioning regresses.

Result

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
talktrans-Workspace	✅	0 %	10	0	10	0fcc3d363

Builds 🔨

Scheme	Status	Duration	Commit
talktrans-Workspace	✅	1m 43s	0fcc3d363