chore(deps): upgrade egui to 0.34.2

[lklimek]

Summary

Upgrades the egui-family dependencies from 0.33.3 to 0.34.2:

• egui, eframe, egui_extras, egui_kittest → 0.34.2
• egui_commonmark → 0.23.0 (egui-0.34-compatible release)

Egui 0.34 ships subtler font rendering (Skrifa + font hinting), unifies the panel API, makes AccessKit always-on, and deprecates a number of Context-rooted call sites. Most of the diff is mechanical renames; runtime behavior is preserved.

Notable API changes addressed

• App::update(&mut self, ctx, frame) → App::ui(&mut self, _ui: &mut Ui, frame: &mut Frame). Body is preserved via let ctx = _ui.ctx().clone(); to keep ~250 ctx-using call sites stable.
• Context::style() / set_style() → global_style() / set_global_style(). ui.ctx().style() chains collapsed to idiomatic ui.style().
• egui::SidePanel / TopBottomPanel → egui::Panel::{left,right,top,bottom}.
• egui_commonmark::CommonMarkViewer API unchanged in 0.23.
• App::on_exit signature drops _gl: Option<&glow::Context> — the project is wgpu-only.
• AccessKit feature flag removed in egui (always compiled in). Runtime gate on DASH_EVO_TOOL_ACCESSIBILITY env var preserved in src/app.rs.

Strategic deferral (debt tracked)

Panel::show(ctx, …) is deprecated in favor of Panel::show_inside(ui, …), which would require threading &mut Ui through 60+ screen entrypoints. To keep this PR within a focused scope, the deprecation is contained at the island_central_panel helper (src/ui/components/styled.rs:543) and direct call sites via narrow #[allow(deprecated)] blocks. A TODO(egui-0.35) breadcrumb documents the deferred refactor — the broader migration to show_inside(ui, …) should land before egui's next deprecation cycle removes Panel::show(ctx, …) outright.

User-visible impact

• Subtle text rendering changes from Skrifa + font hinting (sharper text; pixel positions may shift slightly).
• Edge fade on ScrollArea content.
• AccessKit accessibility tree is now unconditionally available (binary slightly larger).

No functional changes to wallet, identity, DPNS, contracts, or token flows.

Commits

1. chore(deps): bump egui to 0.34.2 — version bumps + Cargo.lock
2. refactor(ui): adopt egui 0.34 API renames and trait shape — mechanical renames + App::ui migration
3. style: apply nightly rustfmt after egui 0.34 refactor
4. docs: bump egui/eframe reference in CLAUDE.md to 0.34
5. chore(ui): address QA cosmetic findings from egui 0.34 upgrade — _ui rename + TODO(egui-0.35) breadcrumb

Test plan

• cargo build --all-features clean
• cargo +nightly fmt --all -- --check clean
• cargo clippy --all-features --all-targets -- -D warnings clean (zero deprecation warnings)
• cargo test --all-features --workspace — 555 tests pass (468 unit + 10 e2e + 72 kittest + 3 doctests + ignored network-dependent backend-e2e)
• cargo test --test kittest --all-features — 72/72 kittest UI integration tests pass
• Manual smoke (out-of-band, before merge): launch cargo run, verify network chooser, identities screen, wallets screen, dark mode toggle, and at least one modal renders correctly under the new font rendering.

Notes for reviewers

• IDE (rust-analyzer) may show false-positive errors in tests/backend-e2e/ — the project's AppContext::{sdk,db,wallets}() accessors and database::test_helpers are gated by #[cfg(any(test, feature = "testing"))]. cargo test --all-features resolves them; configure rust-analyzer with "rust-analyzer.cargo.features": "all" if the noise bothers you.
• 26 #[allow(deprecated)] sites added — all narrowly scoped to Panel::show(ctx, …) and axis-non-agnostic Panel methods. Tracked via TODO breadcrumb at src/ui/components/styled.rs:543.

_{🤖 Co-authored by Claudius the Magnificent AI Agent}

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