fix(desktop): simplify STT model settings

[ComputelessComputer]

Move the language warning into a full-width top banner, hide legacy Cactus model choices unless selected, compact selected and downloaded model rows, and show local model actions only on hover.

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Note

Medium Risk
Primarily UI/UX refactoring, but it changes model-listing/query behavior (e.g., hiding deprecated Cactus models unless selected) and selection rendering, which could affect what models users can choose or see.

Overview
Moves the spoken-language compatibility warning out of the selector and into a full-width TranscriptionLanguageWarningBanner rendered at the top of the STT settings page.

Simplifies the model dropdown UX: the selected model now renders with the same icon/label treatment as list rows, deprecated models are visually de-emphasized, size is only shown for not-yet-downloaded models, and the cloud action button text is standardized to "Upgrade to use".

Changes local model listing/actions: deprecated Cactus models are hidden unless they’re the currently selected model (and only those are queried for download state), and local model row actions (show folder/delete) are now shown via a hover/focus overlay instead of tooltips.

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