fix(rolldown): improve responsiveness for smaller screens

[arashsheyda]

Description

The Rolldown DevTools UI had layout issues on smaller viewports. This PR addresses them with a consistent approach across all session pages:

What changed

Switched toolbars to sticky positioning so they scroll with the page (no more fragile padding hacks)

Removed unnecessary fixed-height containers — most pages now scroll naturally

Kept fixed containers only where needed (graph views with pan/zoom)

Prevented horizontal overflow by adding flex wrapping to buttons and nav rows

Cleaned up a few component quirks (search panel width, hardcoded spacing, etc.)

Affected pages

All session pages, including graph, assets, chunks, packages, and plugins — now more consistent and responsive.

Linked Issues

fixes #214 (sorry in advanced... I did not get any comments on the issue and went ahead with it so apologies for that)

Additional context

Before	After

[pkg-pr-new]

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@vitejs/devtools

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@vitejs/devtools-kit

npm i https://pkg.pr.new/@vitejs/devtools-kit@222

@vitejs/devtools-rolldown

npm i https://pkg.pr.new/@vitejs/devtools-rolldown@222

@vitejs/devtools-rpc

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@vitejs/devtools-self-inspect

npm i https://pkg.pr.new/@vitejs/devtools-self-inspect@222

commit: cc91d9b