fix: correct routing and error message typos

[codealchemist007]

Problem / Issue No.

• Typos found in the code causing incorrect route name and a misspelled error message.
• Issue reference: Fix typos in routing and error message #443

Describe Problem / Root Cause

• The route name was misspelled as /progarm_page in lib/main.dart and lib/splash_screen.dart.
• An error message was misspelled as "Some error occured" in lib/programs screen/open_summer_of_code.dart.
• Root cause: simple spelling mistakes in string literals.

Solution proposed

• Corrected route name to /program_page in lib/main.dart and lib/splash_screen.dart.
• Corrected error message to "Some error occurred" in lib/programs screen/open_summer_of_code.dart.
• No logic or behavior changes — only string fixes.

Additional Information

• Small fix, so nothing risky here.
• The changes are already pushed in the typo-fix branch.
• Should be quick to check and merge.

Screenshots

• Not required for this change.

Fixes #443

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[github-actions]

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[codealchemist007]

@andoriyaprashant, could you please review the PR when you get a chance. Thanks!