Fix form issues, update sign-up button, and add zoom feature

[Pramad712]

1. Fix linking in markdown
2. Fix time slot js
3. Make sign up button grey when no more spots available
4. Use embed form if and only if a form url is given in for the event. Otherwise, use closest match of custom forms.
5. Add zoom feature for posters pop-up

Note: The jsconfig was also edited since the TS errors make vscode go crazy about issues across the codebase

[github-actions]

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[Copilot]

Pull request overview

This PR updates the volunteer opportunity flow by improving link handling in Markdown descriptions, adjusting sign-up button behavior when events are full, refining time-slot selection behavior, and adding zoom support to the posters/programs gallery.

Changes:

• Add explicit Markdown link handling and visually disable the Sign Up button when full/already submitted.
• Update form-selection logic and time-slot range picker behavior.
• Add zoomable posters gallery support (new dependency + gesture handler root wrapper).

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/screens/VolunteerOpportunityScreen.js	Adds Markdown onLinkPress handling; styles Sign Up button as disabled when full/submitted.
src/screens/VolunteerFormScreen.js	Changes fuzzy matching behavior for selecting a custom form; removes explicit unknown-form error path.
src/components/TimeSlot.js	Adjusts range-selection picker behavior to reopen for end-time selection.
src/components/TextField.js	Tweaks input height.
src/components/PostersButton.js	Adds zoom support to poster modal/gallery; optimizes FlatList rendering.
src/components/NextButton.js	Adds disabled styling support.
App.js	Wraps app in GestureHandlerRootView for gesture/zoom support.
package.json	Adds react-native-reanimated-zoom dependency.
package-lock.json	Locks react-native-reanimated-zoom dependency.
jsconfig.json	Adjusts JS type-checking compiler options.

Comments suppressed due to low confidence (1)

src/screens/VolunteerOpportunityScreen.js:108

• onLinkPress calls Linking.openURL(url) without handling rejection, which can produce unhandled promise rejections for unsupported/malformed URLs. Prefer using the existing openURL helper from src/utils (it already catches and shows a user-facing Alert) or add a .catch(...) here.

              </Pressable>
            </View>
          </View>

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