[thedancingdeveloper]

Summary

Ports examples/* onto the vendored gpui, stacked on #15 (WI-1429).

• gallery, demo_app, hello_world, widgets and form all launch through FluentApp::run, which Port fluent-app and fluent-test-utils to gpui_platform #15 already moved to gpui_platform::application(), so they needed no source change. demo_app's key bindings (KeyBinding::new) and surface_blur_layer (a plain Hsla colour) both still resolve against the vendored gpui.
• screenshots was the only example calling Application::new() directly. It now calls gpui_platform::application(), matching the drift report (docs/gpui-api-drift.md). Its WindowOptions fields (window_bounds, titlebar, window_decorations, focus, show) are unchanged in the vendored gpui.
• Neither the video-frames patch (Video frames as standalone GPU textures #9) nor the element-scale patch (Re-port element visual scale onto the vendored gpui #7) was needed: no example uses video textures or element scale.

Stacked on #15. Do not merge until #15 is merged, and not before review.

Gates (Linux, this host)

• cargo check --workspace --examples --offline — green.
• cargo clippy -p <crate> --all-targets --no-deps -- -D warnings — 0 errors for fluent-core, fluent-primitives, fluent-layout, fluent-ribbon, fluent-app, fluent-test-utils, demo_app, form, gallery, hello_world, screenshots, widgets. --no-deps is required: the vendored zed crates fail -D warnings on their own (ztracing cfgs, scheduler, http_client), which is outside this item.
• cargo test --workspace --offline --tests (vendored gpui crates excluded) — all green. The two doctest failures in gpui_macros are pre-existing in the vendored tree.

Operator check

This host has no display, so nothing was run. On a machine with a display:

cargo run -p hello_world
cargo run -p gallery
cargo run -p widgets
cargo run -p form
cargo run -p demo_app
cargo run -p screenshots -- button

Look for: each opens a window themed with the Fluent dark palette and renders without a panic. hello_world shows a counter with Increment and Reset buttons. gallery and widgets show the component galleries. form shows the form. demo_app shows the demo shell; Ctrl-K opens the command palette and Ctrl-Shift-L / Ctrl-Shift-D switch themes. screenshots button opens a 1000x600 window titled "FluentGUI-Screenshots" showing the button variants and writes /tmp/.fluent-screenshot-ready after the first frame.

Regenerating screenshot baselines is WI-1431 and is deliberately not done here.