sync: merge upstream v1.0.146 and resolve conflicts

[shuv1337]

Summary

• Merges upstream tag v1.0.146 from sst/opencode into the fork
• Resolves merge conflicts in fork-specific customizations
• Fixes type errors introduced by upstream API changes

Changes

Upstream merge (v1.0.146):

• New model selection dialog UI
• Updated SDK types (Command, ProviderListResponse)
• SelectDialog component API changes (removed onHighlight prop)
• Icon set changes (removed type and droplet icons)
• useKittyKeyboard type change from boolean to object

Fork conflict resolution:

• layout.tsx: Re-added theme/font state and accessors for fork's theme/font picker features
• global-sync.tsx: Added command property to State type for slash commands
• font-picker.tsx: Removed onHighlight prop, changed icon to code-lines
• theme-picker.tsx: Removed onHighlight prop, changed icon to glasses
• app.tsx: Updated useKittyKeyboard from true to {} (object format)

Closes #117

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch opencode/issue117-20251211083034

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