update login route to be main page

[adhami3310]

No description provided.

[greptile-apps]

Greptile Summary

This PR simplifies the "Sign In" button link in the marketing navbar from a specific /cloud-login?redirect_to=.../callback/ route to just the root REFLEX_BUILD_URL (https://build.reflex.dev/), reflecting a backend change where the main page now handles the authentication flow.

• The old URL explicitly targeted a /cloud-login endpoint with a redirect_to callback parameter; no other occurrences of cloud-login exist in the codebase, confirming this was the sole reference.
• The new URL points to REFLEX_BUILD_URL directly — consistent with how other links in the codebase (e.g., cta_card.py, plan_cards.py, final_cta.py) already reference this URL.
• The change is minimal, intentional, and safe; the "Sign In" button behavior now relies on the main build page to handle unauthenticated users appropriately.

Confidence Score: 5/5

• This PR is safe to merge — it is a single-line, intentional URL simplification with no logic errors or side effects.
• The change is trivial: one URL string replaced with a pre-defined constant already used consistently throughout the codebase. No new logic is introduced, no security concerns, and no other files are affected.
• No files require special attention.

Important Files Changed

Filename	Overview
pcweb/views/marketing_navbar.py	Simplifies the "Sign In" button link from a specific cloud-login route (with redirect_to callback) to the root REFLEX_BUILD_URL. One-line change, no logical issues.

Sequence Diagram

sequenceDiagram
    actor User
    participant NavBar as Marketing Navbar
    participant Build as build.reflex.dev

    Note over NavBar,Build: Before (old behavior)
    User->>NavBar: Clicks "Sign In"
    NavBar->>Build: GET /cloud-login?redirect_to=.../callback/
    Build-->>User: Login page (then redirect to /callback/)

    Note over NavBar,Build: After (new behavior)
    User->>NavBar: Clicks "Sign In"
    NavBar->>Build: GET / (main page)
    Build-->>User: Main page (handles auth flow internally)

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