feat: Adds Search for projects and threads

[Bashamega]

What Changed

I have added a search input that you can use to search both projects and threads.

Why

If you have a lot of threads, you might want to search which project/thread you want to use

UI Changes

Before:

After:

Screen.Recording.2026-03-11.at.12.18.06.PM.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add search to sidebar to filter projects and threads by name

• Adds a search input at the top of the projects list in Sidebar.tsx that filters visible projects and threads by project name or thread title.
• When a search is active, the thread preview limit (THREAD_PREVIEW_LIMIT) is bypassed so all matching threads are shown, and projects with no matches display 'No threads found'.
• The empty state message changes to 'No projects or threads found' during an active search.
• Behavioral Change: drag-and-drop sorting operates over the filtered project set when a search is active.

^{Macroscope summarized 3d6fd97.}

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[binbandit]

This is cool, was thinking of adding something similar... i just feel like the UI / design of the search bar could be a little more minimal / aesthetic to go with the rest of the UI? Feels a little out of place?

We could address this with a command palette system too

@juliusmarminge what do you think?

[Bashamega]

This is cool, was thinking of adding something similar... i just feel like the UI / design of the search bar could be a little more minimal / aesthetic to go with the rest of the UI? Feels a little out of place?

We could address this with a command palette system too

@juliusmarminge what do you think?

I can add the command palette too, but I think if we connect a command to it it is better to make it open in a pop-up, and for the sidebar, we can just add a trigger. I was also thinking of adding more filter options, but this PR would get big. If you are okay with adding filters, I can add them.

[Bashamega]

I have redesigned the input box to be more similar to t3.chat. What do you think, @binbandit if it is better I will push it

Screen.Recording.2026-03-11.at.12.51.53.PM.mov

[maria-rcks]

yeah the ui is still rough, maybe hide it as opt in for people who really want it, but i'd leave ux / ui decissions to both julius / theo

[Bashamega]

Thank you @maria-rcks
Should I start working on making it optional by adding a switch in the settings or wait for Julius?

[maria-rcks]

i'd say just wait for him