PR size limit: hide credit packs, simplify review prompt, and refresh popup copy

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Summary

Track the work delivered in pull request #279 (feature/pr-size-limit-hide-credit-packs).

Pull request: #279

Changes

1. Hide credit packs on PR size limit upgrade prompt

• Added hideCreditPacks option to showUpgradeMessage() / revealUpgradePrompt() in content.js.
• When a PR exceeds the free-plan patch size limit, the upgrade prompt now shows subscription plans only and hides prepaid credit pack actions.
• showPatchTooLargeMessage() passes { hideCreditPacks: true } so users are steered toward upgrading rather than buying credits for oversized PRs.

2. Simplify in-extension review prompt

• Removed the 5-star rating UI and related CSS from components/review-prompt/.
• Submit now opens the correct browser store review page (Chrome Web Store vs Firefox Add-ons) based on moz-extension:// detection.
• Added submitSuppressCutoffDate (2026-06-07) so only feedback submissions on/after that date permanently suppress the prompt; older submits are ignored so users see the updated flow.
• Updated default prompt copy (e.g. “Would you mind leaving us a quick review?”).
• Relaxed cloud-service.js validation so submit no longer requires a star rating.

3. Popup header and manifest copy refresh

• Updated popup subtitle and welcome hero copy to “Agentic code reviews built into every PR page”.
• Reordered platform list to “GitLab, Azure DevOps, GitHub & Bitbucket” in popup and manifest.
• Refreshed manifest name / description to match the new positioning.
• Scaled popup header title/logo via CSS variables so title and subtitle stay visually balanced across breakpoints.

Files touched

• content.js
• components/review-prompt/review-prompt.js
• components/review-prompt/review-prompt.css
• components/integrated-review.js
• services/cloud-service.js
• popup.html, popup.css
• manifest.json

Acceptance criteria

• Oversized PR upgrade prompt shows plans only (no credit packs).
• Review prompt routes Chrome users to Chrome Web Store and Firefox users to Firefox Add-ons.
• Users who submitted feedback before 2026-06-07 can see the updated review prompt again.
• Popup and manifest copy reflect the new agentic positioning.

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Auto-created from PR #279.