1. browse_code — apps/web/src/components/chat/ExpandedImageDialog.tsx

2. browse_code — apps/web/src/components/media/MediaVideoPlayer.tsx

💭 It looks like the MessagesTimeline changes were reverted back to simpler code, so I'm reviewing the current diff scope across the web app's chat-related files to see what's actually changed now. The ExpandedImageDialog issues seem addressed via stateClassName, and the loading feedback that was removed from play buttons now appears handled through the dialog's loading placeholder instead. I'm moving on to check the MediaActions changes now, particularly around the removal of hasActions. Since items always include a save action, the context menu never opens empty, so that concern is resolved. I'm now checking whether ExpandedVideo's failure and loading states correctly derive from the asset URL atom, and whether refreshAssetUrl's return type matches what onRetry expects. Looking at ExpandedImageDialog's keyboard navigation, that seems fine. For MediaVideoPlayer's failure state, the fixed height and width of the panel should comfortably fit the retry and open-link buttons, though I'm noting a mismatch between flex used in the failure state versus block in the loading placeholder styling. The class-merging utility resolves that display conflict correctly, with flex taking priority, and it similarly resolves the aspect ratio and background color overrides as expected. Now I'm checking MediaActions.tsx for regressions — verifying "Copy image" stays excluded for non-image items, and confirming "Save video" is properly disabled when there's no source or asset. I want to trace through the removal of the hasActions early-return logic in the context menu handler to make sure save behavior still works correctly when src and asset are both missing. I'm noticing that this could create an edge case where the menu opens with only a single disabled item, which wasn't the previous behavior for videos lacking a reference — I should check where this scenario might actually be triggered, like local video previews in ChatComposer, so let me pull up MediaActions.tsx to look at the callers directly.

3. browse_code — apps/web/src/components/media/MediaActions.tsx

4. browse_code — apps/web/src/components/chat/ExpandedImagePreview.tsx

💭 I'm checking UI consistency across the diff—the composer no longer needs a loading state since video expansion now builds a blob URL synchronously, and I'm tracing how MessagesTimeline routes file opens through the video mime type check. Now I'm verifying the loading placeholder styling in ExpandedVideo, the failure-state logic when the asset URL mints unsuccessfully, and the video player's sizing classes are all coherent with the rest of the dialog. Looking at MediaActions, I notice the removal of the hasActions gate means the context menu now always opens, even for videos with a null src, showing only disabled save entries -- similar to how the image case already behaves, so this seems like an acceptable minor inconsistency rather than a real bug. For ChatMarkdown, dropping onImageExpand from ChatMarkdownVideo removes the expand button from inline markdown videos entirely, meaning users would rely on the video player's native fullscreen control instead -- this matches the documented product change about built-in controls handling downloads, so it looks intentional. I want to check whether FilePreviewPanel or other consumers still pass an onExpand prop to MediaVideoPlayer that might now be dangling or unused. Looking at assetUrls.ts, useAssetUrlState now handles nulls via EMPTY_ASSET_URL_ATOM, and since the hook is always called unconditionally there's no hooks-order violation there. The sourcePath field is still included in the result, so that behavior is preserved from before. Now I'm looking at whether ExpandedVideo calling hooks with an index-based key could cause any issues. Checking the MessagesTimeline test removal and confirming it's fine, then verifying no unused imports remain after the openingVideoAttachmentId removal — PlayIcon is still referenced so that's fine. I'm also tracing through ChatView's blob preview URL revocation effect and the download path, confirming downloadFileAttachment still correctly handles non-video files while video attachments now route through the expanded dialog instead of the old download-then-play flow. Now I'm checking the video button's disabled state for optimistic attachments that haven't finished uploading, confirming that behavior was preserved. I'm also verifying the expanded video preview's context menu and autoPlay defaults match the previous implementation, then moving on to look for any other real UI regressions. That's not relevant here since click events already stop propagation elsewhere. Checking that MediaActions isn't duplicated since actionsSource wasn't given, and confirming the tooltip trigger wrapper is pre-existing. I'm also verifying that removing the expand button didn't leave unused imports like Maximize2Icon, and checking other call sites for leftover onExpand props that would surface as type errors.

5. git_tools — MediaVideoPlayer|onExpand|onImageExpand

💭 I check whether FilePreviewPanel passed onExpand to MediaVideoPlayer previously—it wasn't touched in the diff, so no. Now I'm verifying ChatMarkdown around line 1279 to confirm the video component after removal doesn't leave unused props or variables like originalUrl.

6. browse_code — apps/web/src/components/ChatMarkdown.tsx

💭 I notice inline markdown videos lost their expand affordance — there used to be an expand button that opened a full-screen dialog, but now they're capped at inline width with only the browser's native fullscreen control available. I'm wondering whether this is an intentional change or a regression worth flagging. Sibling markdown images still support click-to-expand, so videos now lack parity with images. That said, this seems like a deliberate product decision since the PR removes the expand button across both web and mobile. Let me set that aside and look for more concrete issues — I want to check ChatView's expandedImage state, the blob preview URL cleanup effect, and whether removing openingVideoAttachmentId left the composer without a busy state for an async action.

7. browse_code — apps/web/src/components/chat/ChatComposer.tsx

💭 I'm tracing through the click handling: when there's a local file it syncs a blob preview, but for a restored attachment without a File handle, it calls onFileOpen with the uploaded ID, which ChatView checks for video mime type and routes into the preview dialog. I want to confirm whether the composer's onFileOpen prop actually maps to that same ChatView handler.

8. browse_code — apps/web/src/components/ChatView.tsx

💭 I'm wondering if the ExpandedVideo dialog now has a gap: when disconnected, useAssetUrlState may just hang in a loading state forever instead of surfacing the error toast that ChatView previously showed, leaving no retry option for the user.

9. browse_code — packages/client-runtime/src/state/assets.ts

10. browse_code — apps/web/src/assets/assetUrls.ts

💭 When disconnected, if the preparedConnection is null the httpBaseUrl stays null, so I need to check whether the RPC query atom actually fails in that state or just hangs waiting for a connection. The fact that mobile explicitly checks for a "None" connection tag suggests the atom itself doesn't error out when disconnected—otherwise that check would be unnecessary—so I should verify this to confirm whether permanent loading is a real risk. Comparing to main: ChatView's old download path checked readPreparedConnection directly and surfaced a toast when disconnected, and ExpandedImageDialog never depended on useAssetUrlState since images were already resolved before the modal opened—so this loading-forever state is new to this PR. Meanwhile ChatMarkdownAssetImage already has a similar shimmer placeholder pattern for disconnected states, which weakens the "regression" framing somewhat, though that's for inline embeds that quietly resolve later rather than a modal a user actively opened, which previously either errored clearly or never opened at all. I'm now weighing whether this counts as a UI consistency issue, since MediaVideoPlayer's failure state offers retry and "open in browser" affordances that this new modal path lacks.

11. git_tools — createEnvironmentRpcQueryAtomFamily

12. browse_code — packages/client-runtime/src/state/runtime.ts

💭 When disconnected in the available/offline/blocked phases, the asset URL fails, which triggers the failure panel with a retry option—that checks out. For connecting/backoff phases it stays loading indefinitely, which is reasonable behavior for a reconnecting state, and the same applies when connected but the session is still None. So the disconnected case correctly resolves to a Failure. That's not actually a finding, so I'll drop it. Now I want to check what else changed in scope by diffing the in-scope web files at head against the merge base, since the diff I have might be stale relative to later commits like a reverted MessagesTimeline.

13. git_tools — apps/web/src/** 7751299..54b97cc

💭 I'm checking whether removing the old fallback for extensionless conventional filenames like "Makefile" could cause a regression, since it now depends entirely on whether "Makefile" is included in the EXTENSIONLESS_FILE_NAMES set used by the markdown link parser. Since resolveInlineCodeFileLinkMeta lives in the in-scope web app file, I'm weighing whether this link-resolution logic falls under the "UI consistency" review scope, given that link chips are visually part of the UI even though the underlying concern is parsing logic rather than styling. Now I want to actually check isConventionalFilePosition in the client-runtime to see if it's truly a regression.

14. browse_code — packages/client-runtime/src/markdownLinks.ts

💭 I'm tracing how "Makefile:12" gets parsed as an inline code file link, checking whether "Makefile" without an extension is still recognized as a valid file path. Then testing similar cases like "apps/web:12" against the relative path pattern to confirm the new resolver logic still matches the old behavior—looks like parity holds in both cases. Satisfied the refactor is sound, I move back to reviewing UI findings, starting with an issue where inline markdown videos lost their Expand affordance that inline images still retain. I want to check whether the video's native fullscreen button or the right-click save action compensates for this, and whether the docs at composer.md still describe expanded-preview actions as applying to videos. I need to pull up that section to see exactly what it claims now.

15. browse_code — docs/user/composer.md

💭 The docs still describe video embeds as having an expand option, but this PR removes that affordance on web while leaving it in mobile docs unchanged—so inline video loses the Expand control while inline images still support it, which is a real consistency regression worth flagging. Checking FilePreviewPanel, I see it never passed onExpand in the first place, so the only affected consumer is the markdown video embed path. This does look like an intentional simplification tied to the mobile-media-viewers PR (moving attachment viewing into the dialog), but it still leaves web markdown embeds without a way to expand large videos, contradicting the still-unedited docs line about video embed behavior. That's a well-scoped finding to flag inline. I'm now figuring out where the comment lands best — the diff hunk in ChatMarkdown.tsx around the actionsSource/onRetry props seems like the right context line to attach it to, since that's within the modified hunk range. But I'm second-guessing whether this is worth flagging at all: functionally, the native video element's fullscreen button still gives users a way to enlarge the video, so removing the custom expand affordance may not be a real regression, just a UI consistency nuance to note carefully. I should focus on finding genuinely broken states rather than intentional feature removals. Looking at the expanded video component, I want to check whether the sizing classes applied to both panels create any layout inconsistency in the wrapper. Now I'm tracing what happens when a video attachment's mint fails and src becomes null—checking whether OpenMediaLink handles that missing source gracefully or renders something broken. For candidate 4, I'm considering MediaActions now always opening a context menu on right-click, even for elements that previously fell through to the native browser context menu—like composer blob video previews with no reference or onOpenFile, which previously would've shown the browser's own "Save video as..." menu instead. I think this is actually more of a consistency improvement than a regression, since the label "Save video" still lets users download via downloadMedia—so I'll move past this as not a real finding, and check the copy-image disabled state and how expandedImageKey is computed for attachment videos. Continuing to check ExpandedVideo's key usage, the blob URL revocation logic in ChatView, and how ExpandedImageDialog handles null src for images versus videos—these all look fine so far. I'm also confirming that sourceFailed correctly stays false when there's no asset at all, since the atom starts in a loading state rather than a failure state. For a direct-src video whose source is a string, I trace through what happens when the player's own error handler triggers a retry with no custom onRetry—it resets state and reattempts the same source, likely failing again, but the resulting UI change (from a generic "could not be loaded" message to a more specific "Video unavailable" panel with retry and open-in-browser options) seems like an acceptable behavior shift. I'm now checking whether the video element's aria-label is still being applied correctly after these changes. I keep verifying: the pause-on-hidden-document effect still cleans up properly, the style prop still cascades correctly to the root/video/placeholder even though the dialog doesn't override it, the black background is still applied, and the video sits fine within its wrapper element. I'm now looking at how the video's sizing classes interact with its parent container's max-height and max-width constraints. That resolves as fine since it's shrink-to-fit and the author already checked it. Checking that right-click on the video bubbles up to the wrapper's context menu handler, so the T3 menu still triggers correctly, and now includes a "Save video" option for the expanded view, which is a good addition. The pre-existing tabIndex on the dialog wrapper is also unchanged. I'm now considering whether the tooltip showing the file path on hover over the wrapper is working as before, then turning to the accessibility of the loading placeholder — a role="status" span with only an aria-label and no visible text, which may or may not get announced properly by screen readers, though this matches an existing pattern elsewhere. I'm also noticing a UX regression: the loading state for the expanded video dialog is now just a blank black rectangle with no text, unlike the failure panel which does show text, whereas previously there was some busy-state feedback on the timeline tile itself. Comparing this to marked-down videos, which never had a loading state since their URL is pre-minted, and to ChatMarkdown's asset image loading placeholder, which is also just a blank shimmer with no text — so a textless black box with an X button and caption seems consistent enough with existing patterns, even though older composer states used a "Loading…" label; this is minor and I recall already flagging it in a prior review, which the author addressed by styling the panel, so I won't raise it again. Now I'm tracing through the composer's local video path — building the expanded preview item from the file, checking that autoPlay defaults correctly when unset, and confirming this matches the same behavior as on main where the video dialog also defaults autoPlay to true unless specified otherwise. Tracing autoPlay defaulting through the dialog confirms it resolves to true for local files, which matches prior behavior. But I need to check markdown media previews specifically, since those set autoPlay to false for videos — verifying that link-triggered video previews (as opposed to embedded players) still route through the dialog correctly with autoplay disabled and a proper first-frame poster via preload="metadata". This means the expand affordance loss only affects embedded video players directly, not videos opened via links. Inline markdown video embeds still render as native players with fullscreen support, so nothing seems broken there. I'm now double-checking whether OpenMediaLink handles a null src safely.

16. browse_code — apps/web/src/components/media/OpenMediaLink.tsx

💭 I'm checking the failure panels in the dialog—both the image and video variants use white text on the retry/alert elements, and I'm verifying the contrast holds against the dark background across the different button and container structures. Looking at attachment videos without a reference, the tooltip still falls back to showing the source name on hover even when it duplicates the caption below—this is a pre-existing pattern, not something introduced by the change. I confirmed the disabled/aria-disabled semantics on the timeline download button remain intact, then moved to checking whether the composer's video button lost its aria-disabled styling for cursor and opacity. I traced through the composer's click handler for a video whose local file is gone but an uploaded attachment ID exists—it correctly falls back to opening the attachment by ID through the browser preview path, resolving mime type and building a video preview resource, which checks out fine. Now I'm verifying the "unavailable" logic in MediaActions for a composer blob video source, confirming a blob src is treated as available so the save/download action still works correctly. I'm also checking the dialog's layout sizing for playing video—looking at how the wrapper's max-height/max-width constraints interact with the video's intrinsic width and auto height to ensure the aspect ratio is preserved without letterboxing when both dimensions are capped. For a portrait video, since width is auto and height is capped by max-h, the browser scales it down while keeping the ratio, so that geometry checks out fine. Now I'm comparing the loading panel's fixed dimensions against the eventual full-size video, which is an acceptable jump, and confirming whether min-h-0 is actually necessary here. I also want to check for any other unresolved threads — the backslash-relative path issue in packages is out of scope and was already deferred, so nothing to do there. Scanning further, I want to verify nothing still references the old sourcePath shape, that assetUrls.ts's imports are all actually used, and whether importing and re-exporting AssetUrlState as a type from the same module causes any issues. Now I'm checking whether the changed useAssetUrlState signature that accepts EnvironmentId | null will cause a type error in usePreparedConnection on web, since I need to confirm its signature matches what mobile expects.

17. git_tools — export function usePreparedConnection

💭 I'm noticing that ExpandedVideo ignores the already-minted item.src for markdown media videos when an asset is present, instead re-minting the URL through asset state — which seems like a real redundancy or potential bug worth flagging. That refresh:true is fine since it triggers on each mount. I don't see any strong findings so far. Let me double-check the Expand removal, timeline video tile behavior, ExpandedVideo remounting, and FilePreviewPanel's video player to confirm nothing else was affected, then check for any leftover unused imports in ExpandedImageDialog. Everything else in ChatMarkdown, MediaVideoPlayer still looks properly used. Now I want to think through the Expand removal more concretely, especially how FilePreviewPanel constrains video width in its right panel — that's the more compelling angle to pursue.

18. browse_code — apps/web/src/components/files/FilePreviewPanel.tsx

💭 I realize expand functionality was only ever on markdown embeds, not FilePreviewPanel, so I'll flag this as a medium finding: the inline video embed loses expand parity with images, and the docs still reference an expand option for video. Since the check guidance says not to fail for optional aesthetic preferences or unrelated legacy code, I need to weigh whether this rises to an actionable issue or just a doc mismatch worth noting. Since native fullscreen controls remain available for videos, the practical impact is modest even though the affordance asymmetry between images and videos within the same component is real and introduced by the diff. I'm weighing whether to raise this as a low-severity comment or let it go entirely as "all clear," given the risk of flagging something intentional. I'll lean toward posting one precise inline comment on ChatMarkdown.tsx near line 1297, framed as a suggestion, referencing the composer docs line 100 as the smallest fix. Before finalizing, I want to double-check whether the inline video markdown embed has any other path to an expanded view that I might be missing.

19. browse_code — apps/web/src/components/ChatMarkdown.tsx

💭 I've confirmed images still expand but videos no longer do. I'll leave one inline comment at the removal site in ChatMarkdownVideo pointing out the loss of parity with image expansion, and suggest either restoring the expand behavior via the ExpandedImagePreview path or updating the composer docs to reflect the change. Weighing severity: native browser fullscreen still works via the video controls, so users aren't completely stuck, but they lose the richer T3 expanded dialog with media actions and navigation, making the docs claim inaccurate for web. Given the check defaults to failure unless things are clearly clean, I'll report this as a finding rather than mark it all clear. Reconsidering whether to report at all — this is clearly an intentional removal since the prop was fully deleted across both platforms, and the only evidence is a stale docs line. Still, it's a cheap, legitimate observation and the author has been receptive to prior feedback, so it's worth noting. I confirm the doc paragraph explicitly covers web, desktop, and mobile, and since the PR also removed the equivalent expand affordance from the mobile video player, the stale line is now inaccurate for both platforms. I'll post a single neutral-state comment flagging the removed expand affordance alongside the now-outdated doc line. Since docs/user/composer.md falls outside the file patterns eligible for comments, I need to anchor my note to an in-scope file instead — ChatMarkdown.tsx — and mention the doc gap as context. I'm drafting a concise comment there explaining that removing the expand prop breaks the video embed's ability to open in the dialog, unlike the neighboring image embed which still expands on click. I've verified line 1297 falls within the diff hunk range, so the comment can be posted there. I'm also confirming the exact doc wording at line 100 to reference accurately, and now I'll finalize and post the comment.

20. modify_pr — Submitted review with 1 inline comment