feat(feedback): Simplify public css configuration for feedback

[ryan953]

Simplifies the CSS config for user feedback to trim back the number of values that someone needs to set. Ideally all that's needed is something like:

    feedbackIntegration({
      themeLight: {
        accentForeground: 'white',
        accentBackground: 'red',
      },
      themeDark: {
        accentForeground: 'white',
        accentBackground: 'red',
      }
    })

or the css var version:

#sentry-feedback {
  --accent-foreground: white;
  --accent-background: red;
}

There are some internal css variables that shouldn't be overridden right now. They will not be part of the public docs.
Only packages/types/src/feedback/theme.ts is public:

  foreground
  background
  accentForeground
  accentBackground
  successColor
  errorColor
  boxShadow
  outline

[c298lee]

ooo what does filter do?

[ryan953]

it creates the hover effect, the value is set to be brightness(95%).

so people only need to set one color

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	21.65 KB (0%)
@sentry/browser (incl. Tracing)	32.69 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay)	68.03 KB (0%)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	61.43 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas)	72.07 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.05 KB (-0.25% 🔽)
@sentry/browser (incl. Feedback)	37.54 KB (-0.58% 🔽)
@sentry/browser (incl. sendFeedback)	26.21 KB (0%)
@sentry/browser (incl. FeedbackAsync)	30.58 KB (-0.63% 🔽)
@sentry/react	24.33 KB (0%)
@sentry/react (incl. Tracing)	35.66 KB (0%)
@sentry/vue	25.48 KB (0%)
@sentry/vue (incl. Tracing)	34.49 KB (0%)
@sentry/svelte	21.78 KB (0%)
CDN Bundle	24.13 KB (0%)
CDN Bundle (incl. Tracing)	34.06 KB (-0.01% 🔽)
CDN Bundle (incl. Tracing, Replay)	67.73 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback)	72.71 KB (-0.24% 🔽)
CDN Bundle - uncompressed	70.99 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	101.03 KB (0%)
CDN Bundle (incl. Tracing, Replay) - uncompressed	210.64 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	222.93 KB (-0.32% 🔽)
@sentry/nextjs (client)	34.88 KB (0%)
@sentry/sveltekit (client)	33.26 KB (0%)
@sentry/node	147.43 KB (+0.01% 🔺)