Add username + profile link to sidebar

[matmanna]

Before:

After:

transitions between

and

depending on hover state

[greptile-apps]

Greptile Summary

This PR adds the current user's username to the sidebar's UserSummary component, displaying it as an animated hover-reveal that links to their public profile page.

• inertia_controller.rb exposes username in the nav props and settings/base_controller.rb exposes a correctly-formatted profile_url (with @ prefix) for the settings view.
• UserSummary.svelte derives a local profile path via the existing profiles route helper and wraps the display name in an Inertia <Link> that cross-fades to the @username on hover; the fallback (no username) preserves the original plain-text span.

Confidence Score: 5/5

Safe to merge — the change is additive, null-safe on the frontend, and consistent with existing patterns throughout the codebase.

The username field is optional in both the Ruby hash and the TypeScript type, and the Svelte component gracefully falls back to the original plain-text span when no username is present. The profile path uses the same profiles route helper already used elsewhere, and the hover animation is purely cosmetic with no data-flow risk.

No files require special attention.

Important Files Changed

Filename	Overview
app/controllers/inertia_controller.rb	Adds username field to the nav current user hash; straightforward and consistent with existing nav prop pattern.
app/controllers/settings/base_controller.rb	Adds profile_url with correct @ prefix and proper domain to the settings props; consistent with existing hardcoded URL patterns in the file.
app/javascript/layouts/app/UserSummary.svelte	Replaces plain name span with an animated hover effect that reveals the username via a profile link; null-safe, uses correct Svelte 5 $derived rune, and reuses profiles route helper consistently.
app/javascript/types/index.ts	Adds optional username field to NavCurrentUser type; correctly typed as string

Sequence Diagram

sequenceDiagram
    participant Rails as InertiaController
    participant Inertia as Inertia Props
    participant Svelte as UserSummary.svelte
    participant Router as profiles.show.path

    Rails->>Inertia: "inertia_nav_current_user {display_name, username, avatar_url, …}"
    Inertia->>Svelte: user prop (NavCurrentUser)
    Svelte->>Router: "profiles.show.path({ username })"
    Router-->>Svelte: "profilePath (e.g. /@alice)"
    Svelte-->>Svelte: if profilePath → render Link else → render plain span

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_{Reviews (2): Last reviewed commit: "Merge branch 'main' into profile-links" | Re-trigger Greptile}

[skyfallwastaken]

Thanks for the PR! Two things:

• Please fix the merge conflicts
• It would be nice if you could see the username by hovering over the display name, rather than it always being there

[matmanna]

@skyfallwastaken switched to a transition between the displayname and username based on mouse hover. all merge conflicts + pr checks also look good now!

[matmanna]

@greptileai review