[Messhias]

Summary

• Symbol.dynamic (serde default false) with Symbol::new for static definitions; existing files stay static.
• symbol.new {dynamic?}, symbol.list and symbol.duplicate report/keep the flag; Symbol Options offers Static / Dynamic Symbol (overrides and Global Edit still ahead).
• PT-BR for the new Type labels; gaps/ui-parity note the flag is stored.

Test plan

• cargo test -p vectorcraft-engine --lib tests_brushsym::symbol_new_dynamic_flag (passed)
• cargo clippy -p vectorcraft-doc -p vectorcraft-engine --lib -- -D warnings
• cargo check -p vectorcraft-ui-egui

[bflatastic]

Thanks @Messhias. I'm holding this one for an owner decision.

The public docs list Static Symbol and Dynamic Symbol in Symbol Options, but they don't say which one new symbols get by default. With this PR the Dynamic choice is stored but doesn't change anything yet, since per-instance overrides aren't there. The owner needs to decide whether to ship the option before overrides exist, and which default to use.

[Messhias]

Closing for now: held pending an owner decision on Static/Dynamic default and whether to ship the option before per-instance overrides exist. Happy to reopen once that is settled; the branch had gone stale against main.