feat(web): add docsUrl for providers to install from

[KaviiSuri]

Closes #627

What Changed

The health check banner now includes a link to docs, so users know where to download from.

Why

Currently, the installation instructions are not included in error message. can cause confusion.

UI Changes

Before:

After:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add provider docs links to ProviderHealthBanner as 'Installation Guide'

• Adds a docsUrl field to each entry in PROVIDER_OPTIONS in session-logic.ts, populated for codex, claudeCode, and cursor.
• Updates ProviderHealthBanner.tsx to show an 'Installation Guide' anchor (opens in new tab) when the matched provider has a docsUrl.
• Adds ensureSentenceEnds in utils.ts to normalize banner message punctuation.

^{Macroscope summarized 0770674.}

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[Bashamega]

There is always docs, so why make it nullable?