Tasks: t3code visual polish pass

• T001 Capture seeded light/dark scenes and compare with t3code tokens
• T002 Hide the bare "Running" headline on plain-shell sidebar rows (sidebar.rs) + unit test
• T003 Replace working spinners with a pulsing dot (status.rs, style.css), reduced-motion still
• T004 Single-line palette commands with trailing shortcut hint, ~ workspace paths (palette.rs, style.css)
• T005 Dark floating-dialog edge and drop shadow (style.css)
• T006 Recapture, run palette/sidebar GTK tests and scripts/verify.sh fast
• T007 Review fixes: chips revive a quiet row (GTK regression test), raw-path palette search, command accessible descriptions