fix(web): handle thread details context clicks

[Yash-Singh1]

Right-clicking or Ctrl-clicking the branch selector could open the refs search instead of its context menu. The Workspace row also lacked a way to copy the full checkout or worktree path.

Stop secondary mouse presses from reaching the selectors, and add a Copy full path context menu action when a workspace path is available. The thread details spacing remains unchanged.

Screenshots

Copy full path menu:

Thread details before, with the changes stashed:

Thread details after, with the stash popped:

The before and after panel captures have zero differing pixels. Verified in Helium; focused lint, formatting, and web typecheck passed.

Model: GPT-6 Astra. Harness: Codex.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	4.9 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.7 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	20.4 KiB	—	29.3 KiB	✅
Codex	Live turn messages	—	2	—	8	✅
Claude	Total thread wire	—	4.9 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.7 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	20.8 KiB	—	29.3 KiB	✅
Claude	Live turn messages	—	2	—	8	✅

Baseline: unavailable · PR result: 41b5b7c · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 106.1 KiB
• Claude decoded thread snapshot: 106.4 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Approved at 41b5b7c

Macroscope's review found this PR approvable — These localized web UI changes prevent secondary clicks from opening selectors and add an explicit workspace context-menu action for copying an available path. Normal left-click behavior remains unchanged, and there are no schema, deployment, security, billing, default, or static-analysis configuration changes.

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