supabase / supabase / 30100142401

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feat(studio): polish Connect sheet mode selector and steps (#48266)

## What kind of change does this PR introduce?

UI polish for the Connect sheet: clearer mode selection, wider sheet
layout, and step/content chrome across Direct, Server, MCP, and shadcn
flows.

## What is the current behavior?

- Connect modes use a weak selected state and an awkward grid layout.
- The sheet can jump width below the `lg` breakpoint when switching
modes.
- Direct connection chrome is noisy (reset in a footer, Title Case /
mono pooler labels, mismatched copy-button sizes).
- Several steps use admonitions or extra tips that repeat footer
guidance.
- Case-sensitive import of `InlineLink` breaks Linux/Vercel builds.

## What is the new behavior?

### Mode selector and sheet
- Stronger selected/hover treatment; comfortable single row that wraps
via `@container`.
- Empty odd slots use a sunk placeholder cell.
- Sheet uses `size="lg"` with `max-w-4xl` and `w-full min-w-0` so width
stays stable when switching modes.

### Steps chrome
- “Follow these steps” header with a copy-prompt action for coding
agents.
- Optional steps labelled `(optional)`.
- Shared `CodeBlock` for install snippets; MCP feature groups preselect
all except Storage.
- Server / shadcn tips folded into footers; IPv4 add-on admonition is
responsive with an inline Learn more link and a single Enable action.

### Direct connection
- Connection string and connection parameters stay one step (same
credentials, two formats).
- Reset database password lives in the string card title row beside
Shared/Dedicated pooler.
- Card titles use sans + sentence case (`Shared pooler`, `Connection
parameters`); `.env` stays mono.
- Icon-only copy buttons match CodeBlock square sizing; row actions sit
slightly closer to the right edge (`pr-2`).
- Shared pooler toggle copy clarified.

| Before | After |
| --- | --- |
| <img width="390" height="763" alt="API Keys Settings Chisel Toolshed
Supabase"
src="https://github.com/user-a... (continued)

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