fix(web): tidy the Skills settings header, errors, and switch hints

[donnes]

The Skills settings page had a loose count beside a full-width filter, a red "Some skills could not be loaded…" paragraph, and a footnote explaining the switches.

It now uses the same section header as Keybindings: title, then a compact toolbar (count, search, refresh, add). Load errors show as one warning row per environment at the top of the list. The footnote is replaced by a hover hint on each switch ("Shown in / Hidden from skill pickers").

Before:

Screenshot to be attached.

After: screenshot pending.

Done by Claude Opus 5.5 in Claude Code.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 1701041 and cfe2a3c.

📒 Files selected for processing (1)

• apps/web/src/components/settings/SkillsSettings.tsx

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	13.5 KiB	13.5 KiB	+1 B (+0.0%)	15.1 KiB	✅
Codex	Thread snapshot wire	7.1 KiB	7.1 KiB	+5 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.5 KiB	6.5 KiB	−4 B (−0.1%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	56.3 KiB	56.3 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	10	10	0 (0.0%)	21	✅
Claude	Total thread wire	13.5 KiB	13.6 KiB	+17 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	7.1 KiB	7.1 KiB	−1 B (−0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.5 KiB	6.5 KiB	+18 B (+0.3%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	57.1 KiB	57.1 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	10	10	0 (0.0%)	21	✅

Baseline: 1701041 · PR result: cfe2a3c · 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: 114.0 KiB
• Claude decoded thread snapshot: 114.7 KiB

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