feat(review): diff display options — hide whitespace + quick-settings popover

[backnotprop]

Summary

• Hide whitespace setting: Adds a toggle that suppresses whitespace-only changes in diffs (matching GitHub's ?w=1 / git diff -w). Uses parseDiffFromFile with ignoreWhitespace from @pierre/diffs when full file contents are available. Default: off (show whitespace).
• Quick-settings popover: Adds a gear icon to each file header that opens a compact Radix popover with all diff display options (style, overflow, indicators, inline diff granularity, line numbers, background, hide whitespace). Provides quick access without opening the full settings dialog.
• Demo data: Adds a whitespace-heavy demo file (src/config/settings.ts) with re-indentation and alignment changes, plus a vite dev server plugin to serve file contents in demo mode.

Test plan

• bun run --cwd apps/review build passes
• Open bun run dev:review, navigate to src/config/settings.ts
• Toggle "Hide Whitespace" in settings — re-indented function bodies disappear, alignment changes remain
• Click gear icon on file header — popover opens with all diff display options
• Change options via popover — diff re-renders immediately
• Popover closes on Escape and outside click
• Popover does not clip at various panel widths

🤖 Generated with Claude Code

[zeroZshadow]

Thanks for this! I picked up plannotator on recommendation of a friend yesterday, and literally mentioned how I'd love to use difftastic with it for the ability to hide whitespace changes. And boom! The next day you build just that! ❤️

[backnotprop]

It’s now released!!

…

On Thu, Apr 30, 2026 at 3:34 AM Martijn Gerkes ***@***.***> wrote: *zeroZshadow* left a comment (backnotprop/plannotator#631) <#631 (comment)> Thanks for this! I picked up plannotator on recommendation of a friend yesterday, and literally mentioned how I'd love to use difftastic with it for the ability to hide whitespace changes. And boom! The next day you build just that! ❤️ — Reply to this email directly, view it on GitHub <#631 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABXIUHM2D6Q3EXZ5V5RRRDT4YMT2JAVCNFSM6AAAAACYLYBXH6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DGNJRG4YTINZXHA> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>

[zeroZshadow]

It seems "Hide whitespace" isn't only hiding lines where whitespace has changed. It also removes all leading whitespaces. For all lines including those that have not changed.

Enabled

Disabled

[backnotprop]

Ahh.. patching ill release soon with the next set of code review changes. wrapping up on a single view for viewing all diffs