feat(desktop): redesign Codra shell with DP Code-inspired agent workflow

[Abdulmuiz44]

Summary

• redesign the Codra desktop shell around a DP Code-inspired agent workflow
• add a nested provider/model picker with search, favorites, runtime labels, and selected-model display
• introduce Threads and Workspace sidebar modes plus a central composer and refreshed task thread experience
• add light/dark theme persistence and document the DP Code reference patterns adapted into Codra

Validation

• pnpm check:task-loop-protocol-sync
• pnpm --filter desktop build
• cargo check -p codra-core
• cargo test -p codra-core
• cargo check -p desktop

Notes

• preserves the existing task-loop API flow and protocol integrity
• does not include .codra runtime files
• push and handoff remain placeholders in this slice

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Group threads by full workspace path

Using basename(task.workspacePath) as the grouping key merges unrelated workspaces that share the same last directory name (for example, /work/client-a/app and /work/client-b/app both become app). In this commit that causes cross-workspace threads to be displayed in one bucket, which makes thread navigation and workspace context attribution ambiguous. Use the full workspacePath as the internal group key and derive a display label separately.

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