fix(scanner): suppress ASI before catch and finally keywords

[VladimirMakaev]

Summary

• Add catch and finally as ASI continuation keywords so the scanner does not insert automatic semicolons before them on new lines
• Add prec.right to try_expression to resolve the dangling-else style grammar ambiguity between ending the try expression and continuing with catch/finally
• Remove the now-unnecessary [$.try_expression] conflict declaration (resolved by prec.right)

Fixes common Kotlin patterns that were previously misparsed:

try { foo() }
catch (e: Exception) { }   // second catch on new line
catch (e: Error) { }
finally { close() }         // finally on new line

Test plan

• All 286 tests pass (282 existing + 4 new)
• try {} catch {} catch {} — both catches in try_expression
• try {} catch {} finally {} — finally in try_expression
• try {} catch {} // comment then catch {} — line comment + catch
• try {} catch {} // comment then finally {} — line comment + finally
• try {} finally {} — control case, already worked
• Parser size unchanged (229 bytes smaller due to conflict removal)