Add Q1 and Q2 Tiny Wins ships to ships page

[ashleywolf]

Adds 14 feature ships from the Fixing OSS Pain Points / Tiny Wins tracker (Jul-Dec 2025).

Q1 ships (9):

• User-defined tab width applied consistently
• Default tab size changed from 8 to 4
• Contributing guidelines added to repo tab and sidebar
• Clearer PR reviewer status and approvals
• Custom headers in Issue/PR email notifications
• WebP image support
• Improved file navigation and editing in web UI
• Improved relative/absolute time threshold in Actions
• One-click merge conflict resolution in web UI

Q2 ships (5):

• Improved blocked users view in org + personal settings
• Removed notifications from @mentions in commits
• Org-level setting to control repo admin GitHub App install permissions
• Notifications sidebar counter spam fix
• Block org members from requesting GitHub App installations

Note: Three items have placeholder changelog URLs (pointing to github.blog/changelog/) that need real links filled in:

• Actions time threshold
• Org-level GitHub App install permissions
• Block org members from requesting GitHub App installations

All 7 ships.test.js validations pass.

cc @moraesc

[Copilot]

Pull request overview

Adds new “Tiny Wins” feature entries (Jul–Dec 2025) to the Ships page dataset so they appear on /ships.

Changes:

• Appends 14 new ship entries (Q1: 9, Q2: 5) to content/ships/ships.json.
• Introduces several new categories (e.g., Actions, Moderation, Organization Management) for display as chips.

Comments suppressed due to low confidence (3)

content/ships/ships.json:120

• This url is a placeholder (https://github.blog/changelog/) and is also duplicated elsewhere in this file. Since the ships grid uses ship.url as the React key, duplicated placeholder URLs will cause key collisions. Please replace this with the specific changelog URL for this ship (and ensure it's unique).

      "url": "https://github.blog/changelog/",
      "title": "Improved relative/absolute time threshold in Actions workflow executions",
      "description": "Workflow run timestamps now switch from relative to absolute format after one hour for easier debugging and correlation.",
      "date": "2025-09-18",
      "category": "Actions"

content/ships/ships.json:148

• This url is still the generic placeholder (https://github.blog/changelog/), which duplicates the placeholder used by other ships in this PR. Duplicate URLs will collide with the React key (key={ship.url}) and can cause rendering issues. Please update to the real, unique changelog URL for this ship.

      "url": "https://github.blog/changelog/",
      "title": "New org-level setting to control repo admin permissions for installing GitHub Apps",
      "description": "Organization owners can now restrict whether repo admins can install GitHub Apps, adding a layer of governance.",
      "date": "2025-11-01",
      "category": "Organization Management"

content/ships/ships.json:162

• This url is a duplicated placeholder (https://github.blog/changelog/). Because the ships UI uses ship.url as the React list key, duplicate placeholder URLs can cause key collisions and incorrect UI updates. Please replace with the specific, unique changelog URL for this ship.

      "url": "https://github.blog/changelog/",
      "title": "Block org members from requesting GitHub App installations",
      "description": "Organization owners can now prevent members from submitting GitHub App installation requests.",
      "date": "2025-11-15",
      "category": "Organization Management"

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