fix: mobile responsive layout for PRs, discussions, prompts, security and activity

[AbhiVarde]

Problem

On mobile devices, five repo sections had broken or overflowing layouts:

• PRs: toolbar controls crammed into one row, causing overflow and cutoff
• Discussions: tabs, search, and new discussion button overflowing in one row
• Prompts: search, sort, and suggest button cut off on small screens
• Security: section tab bar overflowing horizontally with a visible
  scrollbar caused by globals.css setting scrollbar-width: thin globally
• Activity: event filter tabs overflowing with the same visible scrollbar issue

Solution

prs-list.tsx

• Row 1 (mobile): search full width
• Row 2 (mobile): sort + filters + clear + new PR button right-aligned

discussions-list.tsx

• Row 1 (mobile): search full width
• Row 2 (mobile): tabs scrollable + new discussion button right-aligned
• Desktop: original order preserved

prompt-list.tsx

• Row 1 (mobile): search full width
• Row 2 (mobile): sort button left + suggest button right-aligned

security-view.tsx

• Mobile tab bar scrolls horizontally with hidden scrollbar via inline
  style={{ scrollbarWidth: "none", msOverflowStyle: "none" }} to
  override the global scrollbar-width: thin rule
• Added whitespace-nowrap to tab buttons to prevent wrapping
• Fixed double scrollbar by scoping h-full and min-h-0 to md+ only

repo-activity-view.tsx

• Filter tabs scroll horizontally with hidden scrollbar via same inline
  style override
• Added whitespace-nowrap to filter buttons and events count

Files Changed

• apps/web/src/components/pr/prs-list.tsx
• apps/web/src/components/repo/discussions-list.tsx
• apps/web/src/components/repo/prompt-list.tsx
• apps/web/src/components/repo/security-view.tsx
• apps/web/src/components/repo/repo-activity-view.tsx

Screenshots

PRs toolbar

Before	After

Discussions toolbar

Before	After

Prompts toolbar

Before	After

Security tab bar

Before	After

Activity filters

Before	After

[vercel]

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