Fix tooltip spacing

[AdityaMalik7]

Fixes: Tooltip spacing issue for organization/add organization button in the sidebar.
Previously, the tooltip was flush against the sidebar, unlike other sidebar buttons (e.g., Settings, DND, Back, Reload).
This PR introduces proper spacing so that the tooltip now aligns consistently with others, improving visual coherence and user experience.

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📸 Before vs. After

Before (tooltip flush)	After (proper spacing)

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🧪 Platforms this PR was tested on:

• Linux (Ubuntu-based)
• Linux (Arch)
• Windows
• macOS

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🧠 Self-review checklist

• Self-reviewed the changes for clarity and maintainability (e.g., variable names, readability, minimal duplication).
• Clearly explains differences from previous behavior (e.g., issue description).
• Highlights technical choices and bugs encountered.
• Flags any remaining decisions, assumptions, or concerns.
• Automated tests verify logic where appropriate.

🧩 Commit discipline:

• Each commit represents a coherent change.
• Commit messages explain the reasoning and motivation for the changes.

🧪 Manual review and testing includes:

• Visual appearance of the fix.
• Responsiveness and internationalization.
• Tooltip behavior and string correctness.
• End-to-end interaction of relevant buttons.
• Corner cases, error conditions, and potential edge bugs.

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[AdityaMalik7]

Hi @zulip/desktop-team 👋

This PR fixes the tooltip spacing issue for the organization and Add Organization buttons in the sidebar.
All checks have passed ✅ and the spacing now aligns consistently with other sidebar tooltips (Settings, DND, etc.).
Screenshots have been added to show the before and after states.

Tested on:

• Ubuntu-based Linux
• Arch Linux
• macOS

Requesting your review when you get a chance. Thanks!

[alya]

@shubham-padia Could you please take a look to at this one?