This fixes VisualDensity.effectiveConstraints to clamp to the max values of the constraint, instead of to double.infinity.

Update samples to use repo analysis options, Fix sample templates and a ton of analyzer issues (#77868)

* Remove nullOk from cupertino color resolution

* Add CupertinoDynamicColor.maybeResolveFrom

* Remove CupertinoDynamicColor.maybeResolveFrom again

* migrate material to nullsafety

* address review comments

* address review comments

* fix build

* migrate some material files to nullsafty

* address review comments

Complete the migration to the TextSelectionTheme by deprecating the opt-in flag and text selection properties in ThemeData. (#66482)

Based on feedback from various desktop developers, and to be consistent between the defaults and the sample code, this PR switches the default for visual density in desktop themes to be compact instead of standard.

It also removes the same setting from the sample code generated by "flutter create" because it is no longer needed now that it is the default.

Turn the opt-in default for ThemeData.useTextSelectionTheme to true so that everything uses the new TextSelectionTheme by default.

This reverts commit cb92ffc7.

This reverts commit cb4b8677.

* Add punctuation for unterminated sentences in doc comments

* Addressing review nit

Create a new TextSelectionTheme for text selection properties.

* Fix even more unresolved doc references in material

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