feat(web): add Poimandres as a built-in Appearance theme

[gsimone]

Summary

• Adds Poimandres as a dark-only built-in theme in Settings → Appearance (from gsimone/poimandres-t3code)
• Keeps the boot splash palette in sync, including single-mode built-in appearance handling
• Covers the new theme in palette/boot tests

Test plan

• Open Settings → Appearance and confirm Poimandres appears with the other maintainer themes
• Select Poimandres and verify canvas #1b1e28 / accent #5de4c7
• Confirm it stays dark when the OS/appearance mode is light
• Reload and confirm no wrong-color flash before React mounts

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Note

Add Poimandres as a built-in dark-only appearance theme

• Adds a new poimandres built-in theme to themePalette.ts with a full dark-only color map (canvas, chrome, text, accent, terminal, sidebar) and reserves the ID from custom theme use.
• Adds the theme to the settings UI via MAINTAINER_THEMES in ThemeSettings.tsx.
• Behavioral Change: the boot script in index.html now uses a single-mode built-in's sole mode as the base appearance, so dark-only themes like Poimandres render correctly (dark splash/meta theme-color) even on a light OS. Previously all built-ins defaulted to a light base.

📊 Macroscope summarized 54877e5. 3 files reviewed, 0 issues evaluated, 0 issues filtered, 0 comments posted

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[macroscopeapp]

🟡 Medium src/themePalette.ts:127

RESERVED_THEME_IDS now includes POIMANDRES_THEME_ID, but custom themes saved in earlier releases could already use the id poimandres. installCustomTheme only blocks reserved ids on new installs, so a previously-saved custom theme with that id persists in storage but gets silently omitted by getCustomThemes()/parseStoredTheme, causing a stored poimandres preference to resolve to the new built-in theme instead of the user's custom palette. Consider migrating or renaming colliding persisted custom themes on load (or documenting the intentional takeover) rather than only reserving the id going forward.

🤖 Copy this AI Prompt to have your agent fix this:

In file @apps/web/src/themePalette.ts around line 127:

`RESERVED_THEME_IDS` now includes `POIMANDRES_THEME_ID`, but custom themes saved in earlier releases could already use the id `poimandres`. `installCustomTheme` only blocks reserved ids on *new* installs, so a previously-saved custom theme with that id persists in storage but gets silently omitted by `getCustomThemes()`/`parseStoredTheme`, causing a stored `poimandres` preference to resolve to the new built-in theme instead of the user's custom palette. Consider migrating or renaming colliding persisted custom themes on load (or documenting the intentional takeover) rather than only reserving the id going forward.

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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[cursor]

Muted text fails contrast

Medium Severity

textMuted (and the matching muted roles such as placeholder, secondaryLabel, iconMuted, and sidebarMutedForeground) use #767c9d on #1b1e28, which lands around 4.1:1. Other maintainer themes keep muted text at or above 4.5:1, and --muted-foreground maps to textMuted, so secondary labels across the app fall short of the usual AA bar when Poimandres is selected.

 

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[macroscopeapp]

Approvability

Verdict: Needs human review

1 blocking correctness issue found. This PR adds a new built-in theme, which is typically low-risk. However, two unresolved review comments raise substantive concerns: potential silent override of existing custom themes with the 'poimandres' id (data loss), and muted text colors failing AA accessibility contrast requirements. These issues warrant resolution before merging.

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[gsimone]

the overrides stuff makes this PR more annoying than I had initially thought, it might not be worth even if the theme is a classic banger

[gsimone]

#5654 this is so much better!