Pointer: waypoints without a click, readable hand/grab glyphs #433

To do

• Move without clicking: the pointer clicks on arrival at every path waypoint, so it cannot pass through an intermediate point. Add a per-waypoint click flag (e.g. {"time":1,"x":400,"y":300,"click":false}). Reported by a real user.
• Hand and grab glyphs (pointer: a hand glyph that closes on click #381): today an open heptagon plus a triangle "finger", and a bare heptagon; they don't read as a hand or a fist. Draw recognisable glyphs.
• tone: "outline" is nearly invisible on light backgrounds: document it, or give it a thin dark contour.

Definition of done

• A test that fails on current main is written first. For anything visual it is a render test (scenario → frame → pixel assertions); tests that build AnimatedProperties by hand are not enough — that is exactly how the regressions listed here slipped through.
• Each item is verified end to end: scenario JSON, rustmotion validate, render, image inspected.
• cargo fmt --all --check, cargo clippy --workspace --all-targets -- -D warnings, cargo test --workspace pass.
• Vocabulary changes update crates/rustmotion/skills/SKILL.md, the relevant rules/ file and the exported schema. A field the validator accepts must have an effect, otherwise the validator rejects it or warns.
• No comments in Rust code (repository rule). Commits follow <type>: <verb> <message>. No AI attribution in commits, PRs or issue comments.