feat(canvas): show personal space as the user's name

[puemos]

Problem

The personal space is labelled with the literal string "me", both in the spaces sidebar and in the in-space header. People kept finding "me" confusing and didn't realise their personal tasks lived there. Raised in a Slack thread.

Changes

Display the signed-in user's name as the personal space's label instead of "me", with a quiet light-gray "your space" tag next to it — the same pattern Slack uses for the "you" marker beside your own DM — so the row still reads as the personal space.

This is a display-only change. The channel is still identified, routed, matched, and provisioned under PERSONAL_CHANNEL_NAME ("me") everywhere; the personal glyph (lock) and star rules still key off the raw name. A new usePersonalSpaceName / useSpaceDisplayName hook resolves the label, applied in the sidebar row, the back-row header, and the breadcrumb. Sidebar search also matches the resolved name so typing your own name surfaces your space.

Falls back to "me" until the (cached) user record loads or if the user has no name set.

How did you test this?

• pnpm --filter @posthog/ui typecheck — passes.
• biome check on all changed files — clean.
• Vitest: ChannelsList.test.tsx, ChannelBackRow.test.tsx, ChannelBreadcrumb.test.tsx — 28 passing, including a new test asserting the personal row renders the user's name plus the "your space" tag and no longer shows "me".

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog from a Slack thread

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 2b6f1f2.}