Add main landscape layout

[2sem]

Summary

• add an orientation-aware normal-mode layout for landscape screens
• keep portrait behavior unchanged, including hiding output while text input is focused
• arrange input and output cards side by side in landscape
• keep banner anchored at the bottom in landscape, matching the design direction
• extract shared normal-mode header, cards, banner, actions, and error views for the next landscape slices

User flow

flowchart TD
    A[Open TalkTrans] --> B{Device orientation}
    B -->|Portrait| C[Existing stacked input/output layout]
    B -->|Landscape and input not focused| D[Header + mode selector row]
    D --> E[Input and output side by side]
    E --> F[Actions above bottom banner]
    B -->|Landscape with input focused| C

Loading

Verification

• Visual review on iPhone 11 Pro Max simulator: /var/folders/6x/l8h411bn30xd7f7ptkpc48mr0000gn/T/opencode/landscape-main-slice1.png
• mise x -- tuist build
• mise x -- tuist test
• git diff --check

Release / rollback

• Incremental UI-only slice for main normal mode; Table Mode landscape remains untouched.
• Roll back by reverting this PR if landscape layout causes visual regressions.

Result

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
talktrans-Workspace	✅	0 %	10	0	10	aa7b51d92

Builds 🔨

Scheme	Status	Duration	Commit
talktrans-Workspace	✅	1m 57s	aa7b51d92