Upgrade egui stack 0.29 → 0.35

[kakarot-dev]

Summary

Mechanical upgrade of tokito_ui's egui stack from 0.29 to 0.35 — no behavior or visual changes intended. This is the upstream half of TokitoAI/tokito#502 (M0: egui 0.29 → 0.35): the app consumes this crate as a git-tagged dependency, so its egui types must unify with the app's before the app-side bump can compile.

Dependency changes

• egui 0.29 → 0.35
• egui_extras 0.29 → 0.35
• egui-phosphor 0.7 → 0.13 (the release whose egui dependency is ^0.35)
• eframe (dev-dependency, gallery example) 0.29 → 0.35

API migrations

• Rounding → CornerRadius (now i8-backed) — rounding_xs/sm/md() helpers on Tokens now cast the underlying f32 radius fields with as u8.
• Frame::none() → Frame::new(); Margin::same/symmetric now take i8.
• WidgetVisuals::rounding → corner_radius; Visuals::window_rounding/menu_rounding → window_corner_radius/menu_corner_radius.
• Painter::rect_stroke now requires an explicit StrokeKind — used StrokeKind::Inside everywhere (egui's own migration guide's stated default for closed rectangles).
• Context::style()/set_style() removed for per-theme style_of/style_mut_of. theme::apply() now pins the active theme via ctx.set_theme(...) and rewrites that theme's Style in one style_mut_of closure — preserves the prior "single active style, unconditionally overwritten" behavior.
• egui::Id::new now requires AsId (Hash + Debug) — every id_source: impl Hash parameter across components.rs gained a + std::fmt::Debug bound.
• ctx.fonts(|f| f.layout_job(..)) → fonts_mut(..) (layout_job needs &mut FontsView).
• TextEdit::frame(bool) → frame(Frame); false → Frame::NONE.
• The egui::popup module and Memory::{is_popup_open,toggle_popup} were removed as part of egui 0.32's popup/menu overhaul — menu_button and select ported to the new egui::Popup builder (Popup::from_toggle_button_response(...).id(...).close_behavior(...).show(...); open-state reads use Popup::is_id_open).
• Context::screen_rect() → content_rect() (the modal primitive).
• eframe::App::update → App::ui (gallery example only).

Docs

AGENTS.md and README.md version claims updated (egui 0.29 → 0.35, egui-phosphor 0.7.x → 0.13.x, id_source bound note).

Gates (all green locally)

• cargo fmt --all -- --check
• cargo clippy --all-targets -- -D warnings
• cargo test --all-targets (no unit tests exist in this crate yet; example compiles and runs)

For the reviewer

• StrokeKind::Inside is a judgment call, not derivable from the type system — worth a visual pass over cargo run --example gallery in both themes to confirm borders still read the same.
• No public function signatures changed except the additive + std::fmt::Debug bound on id_source params (existing callers all pass Debug types already, so this should not break tokito).

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