[FEATURE]: Add one-click terminal login command for open session views

[vultuk-bot]

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Summary

Add a one-click button in the open session UI (Planning, Build, and Review views) that generates the correct terminal command to reconnect to the same OpenCode session.

Details

Today, users can view an active session in the web UI, but there is no direct action to jump back into that exact session from a terminal. This slows handoff between browser and CLI workflows.

The button should provide copy-ready command text tailored to the current session context (server URL/session ID, and login/attach flow as required), so users can paste once and continue instantly.

Affected Components

Component	Path	Confidence
Share message/tool renderer	packages/web/src/components/share/part.tsx	High
Terminal command renderer for Bash blocks	packages/web/src/components/share/content-bash.tsx	High
Reusable clipboard action	packages/web/src/components/share/copy-button.tsx	High
Shared session page data wiring	packages/web/src/components/Share.tsx	Medium
Session page route	packages/web/src/pages/s/[id].astro	Medium

Likely Implementation Area

Based on codebase analysis:

• Primary location: packages/web/src/components/share/part.tsx:617 currently renders Bash tool output via ContentBash, which is a natural place to expose a dedicated “copy login command” action.
• Command presentation: packages/web/src/components/share/content-bash.tsx:15 and packages/web/src/components/share/content-bash.tsx:51 already separate command and output rendering.
• Copy interaction pattern: packages/web/src/components/share/copy-button.tsx:10 provides a reusable clipboard UX pattern.
• Session context source: packages/web/src/components/Share.tsx:109 and packages/web/src/components/Share.tsx:510 show where session/share identifiers and message metadata are wired.

Suggested Approach

• Add a context-aware action button in Planning/Build/Review session views that computes the exact reconnect command.
• Reuse existing copy-button behaviour for consistency.
• Prefer explicit, paste-ready terminal commands (for example opencode attach ... and/or opencode --session ...) based on what data is available in the active view.
• If required fields are missing, show a clear disabled state with tooltip guidance.

Acceptance Criteria

• A visible button exists in open session Planning, Build, and Review views to copy a terminal reconnect command.
• Copied command is correct for the current session and environment context.
• UX feedback confirms successful copy.
• Fallback/disabled state is shown when a reconnect command cannot be generated.
• Tests are added/updated for command generation and copy interaction.
• Documentation is updated if this changes user workflow.

Effort Estimate

Complexity: Medium
Estimated time: 4-8 hours
Risk level: Medium - requires accurate session context mapping and consistent behaviour across three views.

Reference

• User-provided SDK doc context: https://opencode.ai/docs/sdk/

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