[TheDarkPhantom]

Upstream t3code shipped a batch of app UI fixes since the last sync that the fork's renderer was missing. This hand-ports them against the fork's own code (Lexical composer, smaller timeline, no right-panel split), one commit per upstream PR.

Ported

• fix(web): scrolling a huge thread's history no longer loops the message list pingdotgg/t3code#21269: scrolling a huge thread's history no longer loops or hits React's nested-update limit (timeline row types bucket by length).
• fix(client-runtime): a dropped session no longer reads as a failed connection pingdotgg/t3code#18469 + fix(client-runtime): slow config snapshots no longer drop working connections pingdotgg/t3code#14518: a dropped session no longer reads as a failed connection; a slow first config snapshot gets 75s instead of dropping a working socket at 15s.
• fix(web): settings save again after a stored value fails decode pingdotgg/t3code#19312: one corrupt stored value no longer blocks later settings saves.
• fix(web): a failed run shows Failed, not Completed pingdotgg/t3code#20996: v1 sidebar shows Failed instead of Completed for an errored turn (fork keys on latestTurn.state === "error").
• fix(web): text generation no longer falls back to the expensive flagship model pingdotgg/t3code#19722 + fix(web): the model picker offers every saved custom model, not just the first 32 pingdotgg/t3code#14961: commit messages and titles fall back to the cheap text generation model, not the flagship; the picker lists every saved custom model past 32.
• fix(markdown): Windows paths in messages keep their backslashes pingdotgg/t3code#21069: Windows paths in chat prose keep their backslashes.
• fix(web): recognize Windows terminal file links pingdotgg/t3code#21199, fix(web): terminal links keep Unicode file paths intact pingdotgg/t3code#20264, fix(shared): match Windows home paths case-insensitively in file links pingdotgg/t3code#19627: the terminal links Windows paths (backslash relative, quoted with spaces, ~\), keeps Unicode paths whole, and resolves ~/ when the home folder casing differs.
• fix(clients): copy filesystem paths with native separators pingdotgg/t3code#19201: copied file paths use \ on Windows hosts (chat file links, files panel). Fork has no shared media-actions module, so the formatter lives in apps/web/src/lib/clipboardPath.ts.
• perf(web): sidebar working timers share one clock pingdotgg/t3code#21195: sidebar working timers share one 1 second clock. SidebarV2's WorkingDuration called Date.now() in render with a tick state it never read, so the React Compiler could cache it and freeze the label; it now reads the shared clock value in render.
• perf(web): markdown replies no longer re-render on reconnects and config pushes pingdotgg/t3code#20852 + ChatMarkdown part of perf(web): stop re-rendering the conversation on streamed tokens, typing and server pushes pingdotgg/t3code#20380: visible replies stop rebuilding every renderer on config pushes and reconnects (stable editor list atom, prepared connection read at click time).
• fix(web): leaving the home page while the app loads no longer bounces you to a new draft pingdotgg/t3code#18672 + fix(web): open the startup composer without waiting for every environment pingdotgg/t3code#20183: leaving home during load no longer bounces to a new draft; the startup composer opens without waiting for every environment.
• fix(web): empty diff panel no longer flashes a loading skeleton on every refresh pingdotgg/t3code#17886: an empty diff panel stops flashing a skeleton on refresh.
• fix(web): closed popovers no longer stay on screen and click-through pingdotgg/t3code#18341: closed popovers stop lingering and taking clicks.
• fix(web): stop the "requests are slow" warning from firing on every provider update pingdotgg/t3code#5570 + fix(web): VCS status refresh no longer trips the slow-request toast pingdotgg/t3code#22159: the slow-request toast stops firing on provider/server updates and VCS refreshes. Also fixes the fork passing the environment-suffixed tag to the untracked check, so preview automation was never actually ignored.
• fix(web): failed attachment uploads no longer block sending pingdotgg/t3code#20737: a failed attachment upload no longer blocks Send, and Send retries it (fork's shared settleComposerAttachmentUploads).
• fix(web): terminal drawer keeps its height after the window shrinks pingdotgg/t3code#17658: the terminal drawer keeps its height after the window shrinks and grows back.
• fix(composer): paths such as /tmp/build.sh no longer open the slash menu pingdotgg/t3code#19671: typing a path like /src/foo.ts at line start no longer opens the slash menu (both parser copies).
• fix(web): context meter no longer reads 1000k just under a million tokens pingdotgg/t3code#17539: the context meter stops reading 1000k.
• fix(web): decode timeline image attachments asynchronously pingdotgg/t3code#19923: timeline image attachments decode async.
• fix(web): refresh stale desktop endpoints when Connections reopens pingdotgg/t3code#16026: Connections refreshes stale desktop endpoints when it reopens.
• fix(web): sidebar update pill shows updates on non-default provider instances pingdotgg/t3code#14745: the sidebar update pill covers non-default provider instances.
• fix(web,mobile): keep reporting client activity after an interrupted report pingdotgg/t3code#15738: activity reporting survives an interrupted report.
• perf(web): avoid quadratic markdown link scans pingdotgg/t3code#18387 (investigation): the fork's extractMarkdownLinkHrefs regex was quadratic (270 to 850 ms on 32k char adversarial text, run on every streamed delta). Replaced with a linear scanner that keeps the fork's exact grammar, tested against the old regex.

Skipped

• fix(web): up-arrow recall skips automation and agent messages pingdotgg/t3code#21510 (up-arrow skips automation/agent messages): the fork has no automations or agent-created user messages.
• Upstream 196c397 (Windows toast tag length): the fork shows no OS thread notifications, only a chime.
• fix(web): settings save again after a stored value fails decode pingdotgg/t3code#19312's jsdom hook test and fix(web): scrolling a huge thread's history no longer loops the message list pingdotgg/t3code#21269's browser test: the fork has no jsdom or browser test harness for those files; code ported, logic covered by existing tests where possible.

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