Cosmetic fix: Sync web title with nightly server branding

[StiensWout]

Summary

• sync the loaded web document title with the primary server stage label
• share nightly-version detection between the sidebar badge and title branding path
• preserve existing stable, dev, hosted-channel, and desktop-injected branding fallbacks

Why

PR #3103 fixed the sidebar badge, but the browser tab title still used the static app display name initialized before primary server config arrives.

Impact

Nightly web sessions show T3 Code (Nightly) in the browser tab after the primary server config is available. Stable and malformed versions keep the existing fallback title.

Validation

• vp test run apps/web/src/components/Sidebar.logic.test.ts apps/web/src/branding.test.ts
• vp check
• vp run typecheck

vp check reports the repository's existing unrelated warnings and no errors.

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Note

Low Risk
Cosmetic branding only; no auth, data, or routing behavior changes beyond when the tab title updates.

Overview
Browser tab title now updates when primary server config loads, using the same nightly-version rules as the sidebar stage badge.

Shared helpers in branding.logic.ts (resolveServerBackedAppStageLabel, resolveServerBackedAppDisplayName) centralize the -nightly.YYYYMMDD.N check. The sidebar badge delegates to that module instead of duplicating the regex. Static document.title assignment in main.tsx is removed; DocumentTitleSync in the root route sets document.title from primaryServerConfigAtom, falling back to existing desktop, hosted-channel, and dev/alpha branding when the server is stable or the version string is malformed.

^{Reviewed by Cursor Bugbot for commit 8da10df. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Sync web document title with nightly server branding reactively

• Adds DocumentTitleSync in __root.tsx to update document.title reactively on all route paths, replacing the one-time set in main.tsx.
• Adds resolveServerBackedAppDisplayName and resolveServerBackedAppStageLabel in branding.logic.ts to detect nightly server versions via a version pattern and produce a matching display name (e.g. App (Nightly)).
• Consolidates the nightly version pattern into branding.logic.ts, removing the duplicate from Sidebar.logic.ts.

^{Macroscope summarized 8da10df.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR extracts existing nightly-detection logic into a shared module and adds a component to dynamically update the browser tab title based on server version. The change is purely cosmetic (affects only the document title), includes comprehensive tests, and refactors code the author recently wrote.

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