fix: ::placeholder for input and textarea lighter

[adamleithp]

Problem

Placeholder color for input/textarea was too dark/too high contrast (people were confusing placeholder with a value)

Changes

Made placeholder color lighter (less contrast)
AAA contrast => AA constrast (it's fine)

Text tertiary (in change) is the the lowest contrast we can have before it drops below AA WCAG ratings

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

Locally

[greptile-apps]

PR Summary

Changed placeholder text color in inputs and textareas from --text-secondary to --text-tertiary to reduce contrast and better differentiate between placeholder text and actual input values.

• Modified frontend/src/styles/base.scss to use --text-tertiary for ::placeholder pseudo-element, maintaining AA accessibility standards while improving visual distinction
• Change affects both Cloud and self-hosted environments consistently

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[github-actions]

Size Change: 0 B

Total Size: 9.71 MB

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Filename	Size
frontend/dist/toolbar.js	9.71 MB

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