fix(storybook): fill the app shell viewport

[hqhq1025]

Summary

• remove the inline percentage height that overrides the production 100dvh app-frame rule
• let AppShell stories fill the Storybook iframe instead of ending at the 640px minimum and leaving a white band

Verification

• npm --workspace @maka/desktop run typecheck:stories
• visually checked the default AppShell story at 1200x768; the shell now fills the full viewport with no bottom white band

[hqhq1025]

Visual comparison

Same 1200 × 768 viewport and application state for both captures.

Before

After

[Copilot]

Pull request overview

This PR adjusts the AppShell Storybook fixture so the shell frame can use the same 100dvh sizing rules as production, allowing the story to fill the Storybook iframe viewport (eliminating the bottom “white band” caused by the previous inline sizing override).

Changes:

• Removed the inline height: '100%' on the AppShell story frame so .appFrame / .agents-layout-root CSS (height: 100dvh) can take effect.
• Kept the existing minHeight: 640 guardrail while allowing the frame to grow to the full viewport height.

Required Conclusion (per code-review skill):

1. Is the current solution optimal for the actual problem? Yes. The root cause is the inline height: '100%' overriding the CSS height: 100dvh on .appFrame/.agents-layout-root, and removing it is the smallest coherent fix at the source of truth (the CSS rules).
2. If applicable, what production code can be deleted? none identified.
3. If applicable, what low-quality tests can be deleted or replaced? none identified.
4. Is a deeper refactor required, and what should the final structure be? No deeper refactor required; the story should rely on the same CSS sizing contracts as production rather than re-declaring height inline.
5. Is the reviewed revision ready to merge? Yes.
6. What residual risks or verification gaps remain? Minimal risk; change is isolated to Storybook presentation. No protected-area (security/licensing/release/governance) impact identified in this diff.

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[jackwener]

Story layout is fullscreen; inner shell already uses height="fill". height: 100% on the frame is a percentage of an indefinite parent, so the story does not fill the canvas. Leaving minHeight: 640 is the right floor. Approve.