chore: upgrade egui ecosystem from 0.33 to 0.34

[srperens]

Summary

• Upgrade egui 0.33→0.34, eframe 0.33→0.34, egui_extras 0.33→0.34, egui-phosphor 0.11→0.12, egui_plot 0.34→0.35
• Migrate to the new eframe::App::ui trait method (replaces deprecated update)
• Replace deprecated SidePanel/TopBottomPanel type aliases with Panel::left/right/top/bottom
• Use Panel::show_inside(ui) instead of deprecated Panel::show(ctx)
• Fix all renamed methods: default_size, min_size, max_size, global_style, egui_wants_keyboard_input, egui_wants_pointer_input
• Closes chore(deps): bump egui_extras from 0.33.3 to 0.34.1 #470, closes chore(deps): bump egui-phosphor from 0.11.0 to 0.12.0 #467

Test plan

• cargo check — zero errors, zero warnings
• trunk build (WASM) — builds successfully
• cargo run — native app starts and renders correctly
• Pre-commit hooks pass (fmt, clippy, sensitive content)
• Verify all pages render correctly (Flows, Discovery, Clocks, Media, Info, Links)
• Verify panel resizing (flow list, palette sidebars)
• Verify keyboard shortcuts and zoom controls
• Verify dialogs (New Flow, Flow Properties, Import/Export)
• Verify WASM version in browser

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